90 wt mineral oil

Posted by jacques 1950 On 2011/7/27 4:35:06

I need help. I have a 1950 standard straight-eight which requires (according to the owner's manual), 90 wt mineral oil in the 3-speed manual transmission and overdrive gearboxes. I can't find any anywhere and everytime I do communicate with someone about it (on the phone or in person) I get silence or funny looks. Any suggestions?