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Amsoil? Never heard of that. Yearly oil change...So lets say I put 50,000 miles a year on my car...the oil can't possible be good for all that time, can it?
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Amsoil claims they are the first company to ever manufacture synthetic oil. The yearly thing is for normal conditions on a non-turbo engine. I think it's 25,000 miles or 1 year, whichever comes first. You change the filter every 6 months though. Alot of people have sworn by it and after seeing some of the info on Mobil 1(not worth it), I switched.
http://www.amsoil.com/