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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: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | You can go with detergent, just you will need to change it more often until the sludge is cleaned out. Odds are the previous owner ran detergent oil. Non-detergent oil is found at part stores and farm stores around here. Pennzoil no longer leaves the wax in the engine, I'm running Pennzoil 20W-50 in my 235. Where you are SAE 30 should be good for the summer, you will definitely need SAE 20 or lighter in the winter. I'd recommend using 10W-40 year round if the engine doesn't leak or burn much oil.
Fred
52 3600
69 C-10
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