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Click on image for the lowdown. 
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9 members (Wickedbass, Donf, TexasJim50, treegrower, sron48, Bill Hanlon, rfs56trk, Hanks custodian, Wally / Montana),
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Global Mod,
Mod | | | Forums66 Topics128,075 Posts1,055,916 Members48,429 | | 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!
| | THANKS!
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: Nov 2004 Posts: 121 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2004 Posts: 121 | I always used 10W30 in my 261. This was in a 2 ton truck. Never had any trouble with excessive oil consumption.
Also I think you should use detergent oil. The oils they had when these engines came out weren't as good as what we have today, in my opinion. | | |
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