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Click on image for the lowdown. 
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| | Forums66 Topics128,052 Posts1,055,717 Members48,426 | | 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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| 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!
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| | | Joined: Aug 2011 Posts: 45 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2011 Posts: 45 | Newer engines from all manufacturers are using the very light oils. This allows the camshafts to advance and retard quickly, and variable displacement engine lifters to activate quickly. Some will turn on the check engine light and have a code for the oil being to thick and to change oil.
Joe
The older I get, I only want to work on older rigs.
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