Re: Racing Oil

Posted by Owen_Dyneto On 2013/8/21 9:27:09

SAE 15-40 is an oil for both gasoline and light diesel engines and widely available and used in the hobby. The whole "zinc thing" is pretty much irrelevant to Packard engines as they all have quite low valve spring loadings. If your 36 Packard is a senior it has roller cam followers and the zinc additive is even more irrelevant. Just use a good name-brand oil and change it at least annually.