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Click on image for the lowdown. 
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Global Mod,
Mod | | | Forums66 Topics128,277 Posts1,058,456 Members48,490 | | 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: May 2001 Posts: 1,908 'Bolter | | 'Bolter Joined: May 2001 Posts: 1,908 | I've noticed that the Delo 400 oil for my D*dge diesel is:
15W-40 for conventional oil
10W-40 for synthetic blend
5W-40 for full synthetic
It's the same for Rotella, I think. Does that mean that the synthetics are better lubricating at lower temps so they can go less viscous?
1948 3/4-Ton 5-Window Flatbed Chevrolet 34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
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A good Tech Tip
