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Let's start with: I'm totally biased, since I've been using and selling AMSOIL for over 25 years now.
I've run my non-turbos for a year or 25,000 between drains, filter change at 6 months. I run my turbos (currently 3) at 10K or 1 year.
Mobil 1 is excellent oil. AMSOIL is better. If you want comparisons, go to the AMSOIL website and look it up.
If you open your own AMSOIL account, either as a dealer or as a preferred customer, and if you can accept the longer drain intervals, then AMSOIL is the least expensive oil on the market. If your local dealer doesn't offer you this opportunity, find another.
Even more important than the engine oil is the automatic transmission fluid.
Runs cooler, resists oxidation better, lasts 2-3 time longer than the non-synthetic.
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