[Tom Wesenberg]

But oil is millions of years old, and was refined in the past year, so I'll stick with the thick stuff originally recommended. It helps to slow the gears for better shifting. I've seen some of the dealer mixed oil that is almost black, like dirty oil. I don't know what's in it, but haven't heard of any problems related to it, but I'll keep buying the Mobil 636 from the local bulk oil dealer.