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Click on image for the lowdown. 
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| | | Forums66 Topics128,140 Posts1,056,771 Members48,454 | | 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: Apr 2010 Posts: 474 Shop Shark | | Shop Shark Joined: Apr 2010 Posts: 474 | | | | | | Joined: Jan 2008 Posts: 4,962 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,962 | I use a single weight with ZDDP for break in and then switch to Mobil 1 15w50 in all my jalopies, Farmall tractors, Kohler engines and everything with flat tappets. I do this despite what other say. | | | | | Joined: Apr 2010 Posts: 474 Shop Shark | | Shop Shark Joined: Apr 2010 Posts: 474 | | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | I believe that the most critical time is on a fresh engine. I've always added a bottle of GM EOS on engines that have been rebuilt or have had a new camshaft and lifters installed. | | |
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