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Click on image for the lowdown. 
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Global Mod,
Mod | | | Forums66 Topics128,023 Posts1,055,370 Members48,420 | | 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: Jul 2005 Posts: 640 Shop Shark | | Shop Shark Joined: Jul 2005 Posts: 640 | Unless you just rebuilt the engine, any decent quality oil is fine. I, too, have a '48 3100 and it's been running on everyday oils since 2008 with no problems.
The added zinc is helpful in seating new valves. | | |
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