Originally posted by Mindflux
I was really looking into Amsoil for my 2002 VW GTI 1.8T. And then I found some documents on the web that suggested by the time you hit 6K with your Amsoil it's pertty much run it's life. They questioned how Amsoil touted a 25K life on their products.
All engines will treat oil differently. I've seen analysis of Mobil 1 going 8-9 thousand without a problem. I've seen good analysis of Amsoil going 15-20 without a problem. Amsoil touts the 25,000 mile oil change, but they don't mention that it is under ideal conditions. If you drive all highway miles, then yes, 25k is conceivable. Some cars are just too hard on oil and will cook any synthetic in under 4,000 miles.

I plan on havng my oil analysed just before the six month filter change to see the result. It's been a nasty winter, so I'm curious to its effects on the oil.

Regular synthetic Amsoil run 4.55/qt dealer cost and 5.85/qt retail.