[Jim Brierley]

Use what you want, I'm just saying diesel oils aren't the best for our A's. The additives aren't the same as recommended for gas engines. Zinc wasn't used in the 30's, our engines have steel cams, hardened, lifters and low spring pressure, not cast iron cams and high spring pressure, so zinc isn't nearly as important. There is still zinc in gas oils, just not as much as in the 60's and 70's. I've seen engines running non-detergent oil that are so clogged up with sludge that the oil pump starves for oil and so much sludge in the overhead area that it takes several minutes for it to reach the sump, so detergent is needed. I repeat, use whatever you want.