Amsoil is a very good oil. keep in mind that warranties may be affected by the use of this oil. The XL line is a group three just as the other syn. like QS, PennPlatinum,Valvoline etc. Why anyone would pay more for theXL line is beyond me. Still they have been around for a long time and make a ggod range of products. The other website BITOG< shows very good to so so UOA data,but rep. they have has been great for years.You can find dealers in your area and save shipping costs. I have used this product and it never blew me away but then that is just me.

Grab your Free Catalog today and join the Intelligent Automotive Community. American Made and Environmentally Friendly. No Other Oil Stands Behind Extended Drain Intervals of 25,000 Miles or More. Only AMSOIL Backs This Claim. See Us At http://www.onequartlow.com

Just do the research. Look at the statistics. Just google the best oil. I have used it in my cars, harleys, etc. For the price of a harley, it pays to buy the best. If your one that believes in the 3000 mile myth, you better do your research. I had to write an essay in college on a topic I was unfamiliar with, and it was oil, oil filters, air filters and oil additives. To sum up the 10 page essay and 4 pages of references, including companies that do oil testing to 3m with Dupont for oil additives. Don't bother, just stick with the first in synthetic oils and their filters. It is not even an opinion, it is fact. Overall ratings from flash points, viscocity, bearing wear etc. are the best on average. In the end it is your choice what you put in your engine. I use Amsoil.
I am not a sales person if you all are thinking this. Just do your research before you start typing reviews. Enough said.

Been using it in my Dodge RAM 2500 Cummins with their bypass filter and have seen a noticeable improvement not only in fuel mileage but in smoothness and clarity of the oil even after 20-30k miles. I am extremely pleased.

I was a happy Amsoil customer for 14 years, from 1995 until 2009. The last two year that I used Amsoil, I had problems. When my 0W30 oil had 20,000 (not 35,000) miles on it in March of 2008, the dipstick was very, very black, and the dipstick seemed "burnt". I had changed the oil filter at 17,500 miles as recommended. I looked down the oil fill tube and there appeard to be built-up sludge. I called my Amsoil salesman and he recommended I use 5W30, since I did mostly highway driving. So, I used the engine flush to clean up the engine, put in the 5W30, and tried it out. In March of 2009, 18,000 miles later, the oil filler tube was full of crested black sludge and there appeard to be specked of sludge, looking like pepper, in the oil on my dipstick. So, I drained it and am experimenting with other synthetics e.g. Syntech Synthetic, Mobile 1, etc. For many years I'd use the 0W30 and 5W30, changing the oil filter as recommended, and have great service. The last two years, I have not been too happy.

It's decent. The extended drain 0w30 doesn't really live up to its advertised 26k mile drain intervals. I would never trust it that long, even with their oil filter specific for the application. You can use a high-end Wix/Napa Gold, PureOne, Mobil 1 or Carquest Premium filter and change just the filter at intervals recommended in your car's owners manual (but no more than every 6k) and maybe get 15-17k out of this oil at best. With the Amsoil premium filter maybe 20k. I wouldn't push it any further than that. This oil is too expensive for the extended drain interval to be cost-effective and it really doesn't seem to be a whole lot better than mainstream brands.

Been using Amsoil since 1994. used it on 93 Geo 268K miles to date without having the head off yet. Used their ATF in trans and change it every 30K miles. Same trans with no work on it.
Have a 2001 Ford Focus 157K miles on 0-30 since first oil change. Running very strong and engine is bone dry. Tried their gear oil. It thickens in winter and trans screams when temp under 10 degrees F until it warms up. Change to another trans oil and got better results. No screaming at all. Focus gets 33 to 35 MPG on hwy 26 to 28 in traffic. I log each fill up. GREAT STUFF. Costs more then store oil and less then some other oils BEST VALUE ON THE MARKET. MOST COST EFFECTIVE OIL AROUND.

I notice this oil is very clean and last quite long... (OFC you dont trust what they said the oil could last for 25k miles right?) I change my oil at 5k miles, and the oil still looks good shape.
 Anyway, it helps my car's engine to warm up faster in New England winter weather and also protect my car from stop and go traffic.
 Good one!

shemale316 has been drinking the cool aide, again.
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I've been using Amsoil since 1978 when I discovered it was used in the A-4 SkyHawk I flew in the US Navy. Yes, there is a milspec for Amsoil. For 30 years, every car I put Amsoil in had at least a 5-10% increase in mileage. The best was 15% in a 1978 Corvette with 20k miles, but this may have been due to also replacing the gear lube in the transmission and rear end. For whack-jobs like shemale316, you MUST drive the same route, the same way, and under the same conditions to determine your net change. If you drive a different route and in a different style (e.g. hills with your foot in the intake manifold) you will not see a positive change EVEN IF THE ROUTE IS THE SAME DISTANCE. Also, cold start-ups in cold weather WILL NOT show the same mileage as warm start-ups on warmer days, especially with aggressive automatic mixture (choke) settings that make the car run MUCH richer for longer periods in cold weather.
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By the way, at 58k miles the 1978 Corvette I mentioned earlier broke a valve spring. When I removed the valve cover to replace the spring, the top of the cylinder head looked brand new! Amsoil is so detergent that there was absolutely NO oil film or sludge anywhere. Instead, the head and valve spring assemblies were bright, shiny, super-clean metal!

What is all of this crap about Amsoil being expensive? Are you people on drugs? What planet are you on? How much does 8 to 11 trips to Jiffy Lube cost vs. $50-70 for Amsoil? Man, some of you people simply are not good at math. I've had 4 cars using Amsoil and EVERY ONE OF THEM had an increase in gas mileage by as high as 4.7 MPG. Don't give me this crap about your car not getting better gas mileage. You must be driving in stop and go traffic in NYC or something then or you're a total lead foot.

Anytime I see a post where somebody says Amsoil is expensive, this INFURIATES ME. People like you should be sued for slander and lies. Amsoil costs me NOTHING! If you pay $50-70 to save $200-400/yr. in fuel, HOW IS THAT EXPENSIVE? Some people here are just idiots.

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I never got a fuel economy increase. I track every single mile I drive, type of driving (highway or city), time of the year, brand of gasoline I put in (shell is the only one to give better fuel economy,I would have thought mobil would be up there too)... I know my logging is accurate as I can tell when gasoline has 10% ethanol in it. Ethanol having half the energy density of gasoline should lower fuel economy (oil companies will try to tell you this is not true but this is simple engineering knowledge) I use amsoil now. I dont really care about the prices personally. But I have yet to actually find that it makes any different. It DOES break down slower than conventional oil. It does not get dirty as fast.So it definitely does its job. But pocket-wise it may not. Who knows? I dont have the time to switch between oils and drive around constantly on the same routes to try and find out.

After I started using AMSOIL I am saving money in oil drain change and also I am helping the environment because it is 100% synthetic.

I haven't used a lot of the Amsoil products but from the oil I've used it has been totally satisfactory. In Oregon I can buy the product in "Joe's" stores. I haven't tried their the oil filters as yet but would be willing to try them sometime.

This stuff is pretty good but not as good as its competitor Redlineoil if I cant get this I get Mobil or Mastrol.

What is all of this crap about Amsoil being expensive? Are you people on drugs? What planet are you on? How much does 8 to 11 trips to Jiffy Lube cost vs. $50-70 for Amsoil? Man, some of you people simply are not good at math. I've had 4 cars using Amsoil and EVERY ONE OF THEM had an increase in gas mileage by as high as 4.7 MPG. Don't give me this crap about your car not getting better gas mileage. You must be driving in stop and go traffic in NYC or something then or you're a total lead foot.

Anytime I see a post where somebody says Amsoil is expensive, this INFURIATES ME. People like you should be sued for slander and lies. Amsoil costs me NOTHING! If you pay $50-70 to save $200-400/yr. in fuel, HOW IS THAT EXPENSIVE? Some people here are just idiots.

if anything they are only a tiny bit better than the other oils out there. I've tried it, saw no difference in my fuel economy, and I am crazy about this stuff. I see a difference everytime I do maintenance. But never found any with any amsoil changes. And I got news for you guys. Any synthetic will run 25+k miles without an oil change. Not just amsoil. Just amsoil would rather charge you more, give you less oil, unlike the others who try to get you to buy it more often toi make the same money. Just because an oil is black, doesnt mean it's bad. that's just the detergents doing its job. It's still just as lubricating. Find out for yourself. Run both oils, get them tested as you go. You'll find they both go good for the same amount of mileage.

Hands down the best lubricants money can buy! I've been using all their products (ATF, Oil, Brake Fluid, Gear Lube etc.) for about 18 years in everything from my VW Golf TDI to my weedeater and have never had an issue. The once a year oil change is NOT true, you can actually go much longer but for $52.00 why chance it. It's expensive yes, but you save money over the long haul. You pay $52.00 a year instead of $18.50 eight times a year ($148.00). Everyone has an opinion but when it comes down to the nuts and bolts Amsoil leads the pack and has been doing so since they introduced the first API certified synthetic in 1972.

Have used amsoil asl 5w-30 for the last 4 years on a vehicle with now over 150,000 miles on it. Change it once a year but now seriously considering only every 2 years since everytime the oil sample is analyzed at the end of the year, it looks brand new. My mpg also improved from 18 to nearly 21. I need 5 qts for $35 the filter another $15 for a total of $50 a year so it would be stupid and more costly for me to use any other synthetic. To each their own but I recommended searching for it and giving it a try before forming any negative opinions about it. The only reason it's not in alot of retail stores is because amsoil won't give them a big enough discount for them to turn a profit and since you'll only need it once a year they wouldn't be able to move fast enough or afford to offer it for sale or clearance like they can everything else that is marked up so high to clear it off the shelves.

Been using Amsoil products since 1998. Not a dealer either. Driven over 220,000 miles and mechanic says cars are in the best shape he has ever seen. Gas mileage increased 10%, lower maintenance costs (extended drains, oil, transmission, rear differential, fuel injector cleaner, etc.) No seal problems, compression is the same out of the factory. See you on the road!

I do think most people dont need to spend their money on amsoil when for the most part, changing oil using something cheep like havoline every 5000 miles will work for most. How many miles do you expect to put on your car? I used havoline 5w30 in a honda civic which I did 5k oil changes and sold at 148k. My friend bought it and has 246k on it using the same oil. I forgot, hondas go forever on any oil while in a big three pos, you need amsoil to even think about putting 150k on the engine.

Amsoil is awesome. Amsoil has been making a 1 year or 25,000 mile oil since 1972. Mobil 1 wasn't even thought of in 1972. With the Amsoil nano fiber technology oil and air filters a 25,000 mile or 1 year oil change is possible. Amsoil is also American made and the best oil you can buy. If you have truely researched the quality of motor oils you would already know there is nothing better than Amsoil. Mobil's best motor oil is only a 15000 mile oil which isn't even half as good as the best Amsoil which is a 35,000 mile oil. Mobil 1 15000 mile oil isn't much cheaper than Amsoil 35000 mile oil. It should be half the price of Amsoil since it is only half as good, but it isn't so who is getting ripped off? Do the math.

Mobil doesn't even believe in their own product since they recommend not going beyond manufacturer recommended drain intervals until the vehicle is out of warrenty.

There are all kinds of tests posted all over the internet on how Amsoil out performs other engine oils. If they weren't true Amsoil would have all kinds of lawsuits against them, but they don't. Castrol and Mobil were fighting in court a few years ago and that is also on the internet. I am still waiting for this so called awesome Mobil 1 to file a lawsuit against Amsoil, but it never happens.

Amsoil made in America, by Americans, for Americans. Buy the best, buy American.

the best synthetic on the market. Look at the test reports. I use it in my pumped Harley

Amsoil is a great oil. Nice of someone thinking ahead 30 years ago and make an synthetic motor oil for internal combustion engines. It is second to none. I would use it 10,000 miles and not worry at all.

I have had nothing but excellent results with the Amsoil product. There new Ea series filter and 0W30 oil is what I use in everything I own, except my diesel, that gets the 5W30 diesel oil. My oil has been sampled and checked by blackstone labs to be safe, even after 20,000 miles with no change. MPG has gone up also. Nobody offers an oil filter that even compares to there new line of filters...I've tried them all and have used blackstone labs to verify my results.

Looks like a bunch of propaganda. Performing on bench tests (static tests-Noack, pour, flash point, yes...even the 4 ball bearing wear test(I checked the site)) doesn't mean squat when it comes to active (dynamic reality) motor wear. I am sure Amsoil is a good synthetic.....but why pay so much more for something that is really no better than the other guys...Mobil one, Pennzoil,etc.etc.etc. Also, looking at what info. I can find...Amsoil doesn't have anything (active ingredient) superior to any of the other oils....Mobil One or Royal Purple most bang for the buck. 25k oil change...keep playin' with fire, get burned.

Best on the planet, but a little pricey. I've used it for 25 years and always notice the difference when I put it in.

Best oil ever made. We use it in all of our vehicles and each vehicle gets better gas mileage since the switch and they all start better in the wintertime. We now put it in our four wheelers, generators and lawnmowers, most relizble oil ever. My dad is a licensed Amsoil dealer! AMAZING PRODUCT! For you people who say its hard to find. Most family owned shops carry Amsoil products, plus you can find them online at their website. FOR THE FOURTH TIME, BEST OIL EVER MADE, ONCE YOU SWITCH YOU WILL NEVER GO BACK!!

good stuff. works great with my supercharge camaro

Simply put the best! Yes they back it up and challenge all. Its comical to read some of the following users comments on this web site ----Quaker State, what a joke. Jets, all new Corvetts, NASA program "hence space shuttle" all and I mean all run synthetics, and as far as the following comments about not lasting 25,000 miles from a previous post ----Here some terms you should know about "SPARKY" its called Oil viscosity. Anything under 4% is considered good, ask a Diesel Mechanic. YOU should staying shopping at Wall-MART And oh by the way folks, why over in Europe does the same crap oils recommend changes at 10,000 miles instead of 3000! Hell I bet half of these pole smokers dont even change their own oil and drive JAP CARS!!!!!!!!!!!!

I had an independant lab analysis done after 13,000 kms and 7 months which showed the XL 5W-30 was still good. 12,000 km. or 6 months (whichever comes first) is the limit in the specs.

AMSOIL has new filters that can be changed just once a year (or, for the air filter, less often than that) - so it matches your oil changes. Very nice.

Simply the best lubrication products available for the automotive, farming, industrial, recreational vehicle industry period.If you want to know more contact me at this site.

By far, the best oil available. The only 25,000 and 35,000 mile motor oil that comes with a written warranty to replace any lubricated part (labor included) in the event of an oil related failure. All 3000 of the Texas Department of Public Safety Police cars use it exclusively and change at 20,000 mile intervals (based on used oil analyses) without a single oil related problem for the past 10 years. The only company that compares itself against it's competitors by name in eight ASTM stamdard oil tests.

K&N makes the best filters dumby-AMSOIL is okay but 25k miles and changing filters 3-4 times is redicuolous-where can you find this oil-not many places just their retarded website-that last guy is a fake-he lies about it all-use valvoline or mibil.

I love Amsoil...for those who think it's crap...well I don't know where you are getting that information from. I have run Amsoil in 4 cars now and I have a total of 150,000 miles on them with this oil...not a lick of problems. I did a LOT of reserch about Amsoil before buying...talked to a LOT of mechanics...and I could not find a one with a bad thing to say about the product. In fact my current sales guy is a engine rebuilder...he swears by Amsoil. My last sales guy owned a shop he used it...and after 3 years of waiting for a customer failure with Amsoil his 65 year old mechanic uses it in everything from his truck to his law mower. He didn't believe it either, but he believes it now. I put 50K miles on a year and I love how much time and money it saves me. I have it in the engine and the trany...I'm even thinking about putting in the bypass system.

Quite possibly the best oil-but expensive and hard to find and I don't believe that it could last 25,000 miles. A higher quality Mobil.

Here is the scoop. AMSOIL's patented new nanofiber technology results in the BEST oil and air filters you can get...yes they are more efficient than any other filter out there. You start there when it comes to lubricating your engine, if you have lousy filtration then yes, as someone here put, gunk will build up in the oil. However, AMSOIL is designed with a very robust additive package that enables you to extend your drain intervals (as endorsed by major vehicle manufacturers)up to 25K miles...and AMSOIL guarantees their product. Show me another oil manufacturer that stands behind their product in that way. AMSOIL's new EA oil filters now line up with the oil and are changed once a year without oil analysis. In order for you to further enhance oil cleanliness is to install the EA air filter which is the best air filter on the market when it comes to keeping contaminants out of your engine. Is the price worth it? It is far cheaper to run AMSOIL than to run the regular petroleum oils. It is also way better for your engine. I have used AMSOIL in every vehicle I own for the last three years, and while that may not be the test of all tests on a motor oil, I have complete confidence in their products. Questions? You can email me at timsully@earthlink.net.

I would never run another engine without Amsoil.I pull a 12,000 lb 5th wheel with a Ford V10 and the engine runs cooler & I see a notcable difference in my mileage. Of course Amsoil costs more, it is better and I would only use the best in my vehicles. Expensive? Bet my motor out lasts any without Amsoil.

I like their oil, but I abhor their 'pyramid marketing scheme'. I am changing to another synthetic which I can walk into a store and buy it off the shelf ! !

Have heard some good things about this oil. Problem is I would not want to go 25,000 mi between oil changes. I think the oil is good for that long however too much gunk would build up in the engine. so my question is do you guys change the filter often or just leave it alone ?

Synthetic equals Overrated in my book.

I have worked in the automotive aftermarket for over 30 years as everything from a gas pump jockey to partsman. Amsoil has been the leader in synthetic oils from the beginning of their company. They came out with 25,000 miles as their oil change interval and have not backed off since. I use their products in every engine I own. I have set up several shops so that they could provide a leading edge product to their customers. If you do the math, you will discover that it is cheaper to use Amsoil than it is to use coventional oils. If you want to use the best then use Amsoil.

Amsoil is rediculous for the price they are trying to sell for. Oil change every 25,000 miles? You will have to change the oil filter 3 times before you change the oil. NOT REALISTIC and CONVENIENT AT ALL !

25,000 miles between oil changes, lowered engine operating temperature, lower amount of friction, and I gained 3 miles per gallon. The only true 100% synthetic oil on the market (no petroleum basestock or additives--Mobil 1 doesn't can't claim that piece of information!!!!) Made in USA, and is the absolute best!!!!

these guys are terrorists hopefully the oil companies see what they're up to and shut them down