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Click on image for the lowdown. 
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8 members (walter74, TexasJim50, MarkT, Gdads51, Hotrod Lincoln, Tinker5, MNSmith, 39Master85),
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Global Mod,
Mod | | | Forums66 Topics128,164 Posts1,056,978 Members48,458 | | 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: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | This Shell Rotella 15W40 already has "a shot of ZDDP"."Our Rotella T4 15W-40 (CK-4) contains about 1200 ppm of zinc and 1100 of phosphous. These are the components of the ZDDP for anti-wear protection. Rotella T4 15W-40 (CK-4) is generally recommended for older flat tappet cam motors."" | | |
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