I noticed Rotella changed their formulas for oil and was wondering what everyone was using these days for a non synthetic alternative ? It doesn't look like you can get CC or CD API any longer.
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T6 is 5-40. T4 is 15-40I'm using Rotella T6 -- synthetic 15W40 for a few hundred thousand. Works fine.
I got a 5 gallon pail of this from my neighbour. Would it be a good choice for a 1983 3b with a turbo?
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3k miles change interval. Not remotely worried.
Why are you throwing away good oil at 3k miles?
Comfort. How long do you run your cheap dino oil and do you have some oil analysis sheets to share?