I am using mobile 1 5w-30 but i'm about to switch over to super tech. I'm already using the super tech oil filter. I just found out that the walmart in my area super tech oil's is made by pennzoil/quakerstate! No need for me spending extra dollars. Like manix stated, FRESH oil is the best to use. The key to long engine/car life is to change ALL of your fluids on schedule. Also found out that some of the walmart's on the east coast, their super tech oil is made by ExxonMobile!! Here is proof
http://msds.walmartstores.com/cache/26901_1.pdf
Just wish I was in that area because I know for sure that I wouldn't buy anything but that (super tech that is)!! If the product is an API SM/GF-4 rated Motor Oil its the same. I'm not expert, but I think that's true. Same as some people generic otc drugs are inferior to its name brand counterparts which is not true (my brother is a pharmacist). Generic drugs have to past the same FDA specs as name brand drugs. You are paying for marketing. Also NAPA oil is made my Valvoline, atleast the one in my area.
Modified by NightRiderQ45 at 10:27 PM 10/25/2007
Modified by NightRiderQ45 at 10:47 PM 10/25/2007