Wal-Mart Super Tech Motor Oil 4

Having been an auto mechanic and machinist for 15 years(no longer in the bus.) I've seen some interesting things including a dodge dakota v-6 go 37,000 miles on one oil change.  Any oil you use that meets the API certification recommended by the manufacturer of your vehicle will perform basically the same.  The major difference among all oils is the additive package that is added to the base oil.  Except where synthetic oil is concerned.  Mobil 1 is the only synthetic oil I know of that is "truly sythetic".  The other synthetic oils don't have as many synthetic molecules as Mobli 1.  All conventional oils or "dino" oils will do just fine as long as you change your oil roughly every 3K or 3 months (whichever comes first).  When an engine is started, the condensation inside the engine needs enough time at a high enough temperature to burn off, if not, it will, along with microscopic dirt particles that bypassed your air filter, and the additives in the oil - create sludge. Short driving trips (under 10 miles) and around town driving are the hardest on an engine oil. If you plan on towing or driving in very cold climates then synthetic would be the best oil to use.  If you do normal driving and you don't plan on keeping your car for 20 years, then conventional oil is just fine. As far as what "weight or viscosity" to use, use what is recommended by the manufacturer unless you live in hot(over100) or cold (under 10)climates then you would want to go up or down in viscosity such as using 15-40 instead of 10-30 in hot climates, or using 5-20 instead of 10-30 in cold climates.  I've seen a Chevy S-10 Blazer go an easy 250K miles using nothing but 20-50 oil and I had the priviledge of rebuilding that engine (though I don't know why after tearing it down). Todays engines have tighter tolerances(0.5-1K) and therefore need a thinner viscosity oil compared with older engines(1-3K tolerances) so it can flow to critical engine parts quickly, preventing wear.  The bottom line:  Change your oil every 3 mo or 3K miles whichever comes first if you use comventional oil.  I would never push any synthetic over 5-7K myself, depending on driving conditions. I've seen 3 engines go bad that used nothing but synthetic, including Redline and Syntech, from day 1.  One of them was my dads, so I know how it was driven.  Always check your oil level (weekly).  Don't keep changing between brands of oil (different additive packages in the oil don't always blend well, therfore helping create sludge.  And while Super Tech may not prevent quite as much wear as Valvoline or Mobil 1 (because of the additive package) in certain laboratory tests, you will never keep your vehicle long enough to ever find out.  AS FOR ME, I'M USING SUPER TECH BECAUSE IT WORKS AND I DON'T HAVE TO PAY FOR THE MARKETING USED TO HELP SELL THE TOP BRANDS.