I've been using this oil for 10 years. Started at the advice of a stock car driver.
I first used in a 93 Dodge Dakota w/ a v6 Magnum engine.
Traded at 90,000 miles for a 99 Dakota.
Started using RP in it at 500 miles. Traded it at 120,000.
Made trip from Oklahoma to New York and back, with a trailer load of furniture.
Drove all over upstate NY and into the City 2-3 times. I had to go to Watertown from Utica. to find it up there. It is easier to find now.
Made a trip to Florida with same trailer and drove around Florida from coast to coast.
Traded the truck for a 2004 Ford F150. Dealer would not give me enough, because of mileage.
So I kept the Dodge. Sold it to son-in law, cheap. Drove it back to Oklahoma.
He is still using the truck & RP oil. 145,000 miles.
It NEVER used any oil while I had it. Son-in-law tells me it still doesn't.
I put it in the Ford, 2 days after I bought it. 12,000 miles. I now have 55,000, uses no oil.
So, I put it in my 2008 Harley Davidson Dyna. Bike runs 15% cooler than with other oils.
Not my opinion. HD Mechanic atsted this to me. Runs better, shifts smoother. Just like the Ford.
Would I recommend it? You Bet.
I can't say for other machines, just the ones I have.
I was advised not to use it in my new zero turn mower, no synthetics. I don't.

mower.
Good Luck.

I recently had a bad experience with a group of Stihl saws and one Homelite after switching to Royal Purple brand 2-cycle oil. I had used it previously on my McCulloch saw with no trouble and on my Echo weed whipper. When I tried using it on my big Homelite saw, the saw seized up. Since it was old, I thought it was just tired. A couple months later, I hired a sawmill to cut a white oak into timber. This tree was 40" in diameter. A friend cut it down and then I had to cut off the branches and split the main trunk which was too large for the sawmill. First, my Stihl 260 quit after 1/2 hour. I thought that maybe the plug fouled out. I then got out my 660 and started splitting the log. Since we were looking for 17' timbers, this was a long split through a big tree. I cut for about 10 minutes and the 660 stalled and would not restart. I went to my other 660 and resumed the cut. After only 5 minutes, that too quit. I took these saws back to the dealer to be looked at. In the mean time, I ended up buying an 880 in order to complete the job. They supplied the first tank of gas. I got through the rest of the tree with no problem. When I went to pick up my saws, the repair man a Weingartz told me that all three had scored the pistons and cylinders because of bad oil. I had been running 25 to 1 Royal Purple oil. This was the air cooled variety. The repairs amounted to just under $2000.00 for these three plus the Homelite that had burned up earlier. I contacted the dealer for Royal Purple. He said to bring in a sample of the fuel. Weingartz gave me a jar of the fuel from the tank of one of the 660s. The people at Royal Purple tested the oil and told me that it was actually more like 20 to 1 but thought that in the handling and transport, some gas may have evaporated. The rep said that the oil was indeed their synthetic oil and that it passed all of their tests. I wanted to know if they were willing to pay for all the damage to my saws. The rep at Royal Purple told me no, the oil met their specifications and so they would not pay for any damage. He did tell me that the oil was the right type for air cooled chain saws and they he had used it extensively in his weed whipper with no trouble. I asked if I had to sue to get satisfaction. He then said that once a law suit was discussed, end of discussion, I would need to talk to their attorney. Since getting the saws back, I have extensively used all of them with no trouble using the Stihl brand oil and cutting big oaks and ash trees. I no longer buy anything from Royal Purple, even though I was buying by the drum at work. The TCW-3 oil in not properly rated in my opinion. It is more suited to water cooled engines or snow mobiles. It cannot take the heat generated by medium to big chainsaws.

I usually run Valvoline 10w-30 conventional in my 97 F150 (4.6 with 165k miles). Only reason I tried out Royal Purple is because somebody (probably someone's ex-girlfriend) threw 6 unopened 10w-30 quarts into my trash bin at work...SCORE! So I say hey I need to do my oil change anyways. I bought one extra quart at $9.00 and a Motorcraft oil filter. Put it in and really didn't notice a difference. Fast forward a few days later and I do notice the truck is slightly quieter at startup. The engine was slightly noisey for the first minute or so but would go away quickly (think 165,000 miles). Truck runs great but no better then when it had regular Valvoline. I believe that you might see a difference or might need this oil in a high rpm or high horsepower engine but since I have a high mileage 4.6 Liter V8 pumping out 220hp, I think ill stick with my Valvoline @ $10.49 for 5 quarts instead of $9.00 a quart Royal Purple. I just can't believe someone threw out $54.00 in motor oil what a fool =P

I might be biased since I help promote for Castrol, but I think EDGE is far more superior than Royal Purple. EDGE was proven in industry tests to provide unsurpassed engine wear protection that no leading synthetic oil, including Royal Purple, can beat.** EDGE offers guaranteed extended drain interval protection for up to 15,000 miles, or one year, whichever comes first.* In addition, EDGE meets the API SM, API CF, , Ford WSS-M2C929-A, GM 4718M, GM 6094M, ACEA A1/B1 and ACEA A5/B5 specifications and Royal Purple does not. Castrol SYNTEC and Castrol EDGE are both ILSAC GF-4 certified. Royal Purple does not meet the standards of ILSAC GF-4.

*Guarantee excludes severe service applications such as frequent towing and hauling, racing dirty conditions and extreme idling. If your vehicle is covered by a warranty, follow your car manufacturer's recommended oil change/service intervals, which can be found in your owner's manual.
**Results based on Sequence IVA wear test.

Good Stuff.

I have a Bombardier Outlander 400cc ATV. I change oil every 20 hours. Last month, at the 80 hour mark, I used Royal Purple for the first time. The difference was immediate and dramatic...started quicker, ran smoother and much quieter.

I would use it but it is uncommomly pricey,instead I started useing Mobil1 Syn and went from there to Super Tech syn and I like it best.

Best motor oil you can buy. helps reduce heat and noise. would use it over any other synthetic oil.

Great synthetic oil. There was a noticable differance in the smoothness, power, and fuel economy within 100 miles of using this oil. Royal Purple is some great stuff.

This is overrated and I see no preformnce benifit like I did with redlineoil or castrol syntec.

good oil had a 65 pontiac tempest with a 326 v8  had a knock tried a few different things. someone told me to give this oil a try i thought yeah right. i gave it a shot honestly within probably 30 miles it was gone kept the car for about a year or so before i sold it continued running royal purple till i sold it knock never came back. true story.

Mostly For Performance vehicles

pretty good stuff. a bit expensive though.
good in high performance cars.

Wow! I am amazed there is such loyalty and emotion when it comes to brands of motor oil. Royal Purple makes a large variety of lubricants. They concentrate solely on lubricants unlike many others which are fuel and petroleum companies. I have heard lots of good things about this oil. One of my husband's friends that is a mechanic says it will make your engine last longer. He also says his truck has more power after using this oil. I think he is just like everyone else and has his own opinion when it comes to oil. Some say as long as it's greasy and others swear by all the different blends. Obviously all brands must be good because there is someone out there that will swear that every brand I have ever heard of is the very best. Royal Purple seems a little pricey to me so I guess we will stick with Valvoline which hasn't failed us yet.