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BTW, have @ 900 miles on the second change and the fuel mileage is 25.8 mpg and we've had a number of cold mornings/days here lately. I'll post the UOA when I get it. - TC

Stale post. I'm late to this party, but wow, you guys are harsh. Full Disclosure - I went out of my way to buy German Castrol for my C5.... back when it was still green I like to experiment. I've messed around with Slick 50 (caused seals to leak but increased my fuel mileage without other...