Re: Oil weights

Posted by Chuck McDonald On 2023/10/31 10:23:37

I was told by the gentelman that actually rebuilds the overdrives and transmissions that you shoul only use the Napa GL-1 mineral gear oil because the modern additives destroy the brass bushings especially in the overdrive, and like you use 15W40 Rotella, my car shifts great and the overdrive kicks in smoothly