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Click on image for the lowdown. 
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| | | Forums66 Topics128,014 Posts1,055,328 Members48,419 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Oct 2008 Posts: 321 'Bolter | | 'Bolter Joined: Oct 2008 Posts: 321 | I ran that weight of oil one time. It was in a '77 Ford F150 w/ a 400 and I only ran it in the summer. Didn't notice any kind of benefit in any way over 10/30. Your best bet is to just stick with the recommended oil viscosity.
1963 Chevy C20 Longbed Stepside
1978 Chevy K30 Custom Deluxe
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