Re: 1951 Standard Transmission / Overdrive oil change

Posted by Owen_Dyneto On 2009/2/15 15:47:17

You should have no concerns using an EP gear oil in your trans and OD, I've used them for decades w/o problems in Packards of many vintages. I generally use SAE85W-140.

Yet, the Studebaker technical experts advise against it in their cars, and say either use GL-1 gear oil (not the easiest to find), or plain old SAE40 motor oil in the OD unit.