Re: Engine oil recommendations for my 1925 Packard

Posted by Owen_Dyneto On 2020/3/26 14:12:24

Less viscous oils offer less resistance to flow, run cooler, and thus circulate more quickly which means they transfer heat better which is particularly important with poured bearings. My choice, assuming your engine is clean internally and in good condition, would be to select a modern major brand single viscosity detergent oil of the viscosity that Packard recommended for the temperatures you expect to encounter. I use CAM-2 or Formula Shell SAE 30 detergent in the not too dissimilar engine in my 1934 Eight.