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Reply to "5w20"

Car dealers try to deny claims based on oil change history all the time:


http://consumeraffairs.com/automotive/dodge_dur_oil.html


Remember, the car company will have extremely high priced legal advise, and they can claim that prior poor maintence caused the problem, even if the oil currently in the engine analyses OK.


Having said that, Amsoil apparently would protect a customer in that situation, or try to:

http://www.north-american-lubricants.com/articles/extended_drain_intervals_warranties.htm

Personally, I feel more comfortable using a mid priced synthetic and changing it at the absolute longest manufacturer apporved OCI during during the warranty. That would be something like 7,500 miles on Mobil 1 for me. Amsoil certainly performs well, but I'm unsure if very many people actually need the additional performance it offers over Mobil 1, Delvac 1, or German Castrol, espeically if they do not plan on keeping their cars for 200,000+ miles.
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