Re: 1966-81 Chevy H/J Series
That's good to hear that Rotella T1 is Low Ash.
I wasn't aware.
Wonder if it is a newer blend?
I'm currently using Conoco HD Fleet 40.
You are also correct on the straight grade.
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'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan
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