What would be a safe drain interval with Amsoil full synthetic (not the 7500) for someone that primarily does all short trip driving? Amsoil does not mention that possibility anywhere that I have seen. Is it still safe to run well beyond 10,000 miles, even with mostly cold weather short trip driving? I just bought a case of 10w-30 ATM cause my neighbor is a dealer...wo hoo!!! Well, it's actually this guys mother and father who started their Amsoil business but their son basically took it over. Hehehe, all I have to do to get any Amsoil product I want is to walk two houses up from mine
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