Re: Oil weights

Posted by JWL On 2023/8/22 11:19:19

In my formerly owned 115C I used 15W-40 Classic Car oil in the engine (bought it from Classic Car Club of America). 85W-140 GL-l gear oil in the transmission and 85W-140 GL-5 gear oil in the differential. Actually, any 10W-30 engine oil will work too. Make sure the differential oil is GL-5 rated. GL-1 for the transmission is needed in the transmission and overdrive.

P.S. Don't worry about having to use high Zinc content motor oil. These straight eight Packard engines don't need it.