I'm running their straight 30 weight in my Z to combat the premature breakdown of ethanol and this stuff is doing FANTASTIC! I was running royal purple for the previous years and I wil never look back! Royal purple would start to see alcohol fatigue after 1000 miles.t I check the dip stick to finger test the viscosity of the Schaeffers and so far it remains just as "sticky" as the day I put it in with a little over 1k miles since startup. I will continue to monitor this oil to get an idea of its life span but I wouldn't be surprised if daily driven petrol fueled cars could run this oil well into the 6 & 7000 mile ranges
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