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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2016 Posts: 264 'Bolter | | 'Bolter Joined: Jan 2016 Posts: 264 | So now that I can drive the truck I first want to get oils changed.. any recommendations - motors actually a 1973 or so 292 now, not certain of 4 speed tranny, and rear end is a vacuum shift 2 speed GMC which I think is original.
I've read that engine oil for a diesel has more zinc in it, or regular oil plus additive best?
For tranny, and rear end I'm planning standard 80w90..
Being for the big bolt posted here, but let me know if moving to engine or driveline forums best... | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | I'd use 80W90 for the rear and transmission.
For the engine I'd use a straight 30 weight like Shell Rotella. | | |
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