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Mod | | | Forums66 Topics128,142 Posts1,056,478 Members48,441 | | 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: Mar 2014 Posts: 4,502 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,502 | Shell reduced the ppm of ZDDP a few years ago. It was at one time 1600, then went to 1400 or so and now is 1200 (give or take...some weights are more like 1000ppm) I've read. There are better options if you want more ZDDP. Valvoline VR-1 still has 1400 last I checked and this should be plenty. There is one out there...Lucas Racing Oil I believe which has 2000ppm. At this point you may be flirting with too much and too much ZDDP will cause problems as your oil will become acidic and corrosive and you'll risk some serious damage.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
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