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I've always been told "if you need to add an additive to your oil, you're not running the right oil", so I'd prefer to stick with my Amsoil Zrod 10w30.

Right now I'm running Amsoil's Zrod 10w30, which has been VERY good. I ran VR1 not too long after I broke-in the engine and didn't really have any problems. If I don't go with MC 5w-40 I'm goanna stick with one of those two oils.

https://www.ford-trucks.com/forums/1735563-bad-oil-report-with-motorcraft-5w40-synthetic.html I'm pretty sure Blackstone measures Zinc by PPM. In the link above, somebody sent a used oil sample out of their 7.3 PowerStroke to Blackstone Laboratories and the test shows the "Universal Averages"...

I've seen only a few Black Stone Lab tests on this oil and it pretty consistently has above 1200 ppm of zinc and 1150 ppm of phosphorus. The problem is because it's a diesel oil, the detergents could potentially wipe the zinc off the cam lobes. I ran the 10w30 version of this oil in an old 400...

Howdy people. This past spring I built a 1977 Ford 400 and installed Comp Cams 268H camshaft in it. I want to run a 5w-40 oil in it so it'll lubricate better on cold starts but also has characteristics of a 40 weight oil at operating temperature. There are no oils thinner than 10w30 that are...