*Bumping this thread back from the dead.*
Having the itch to work on the car today I thought, why not change the trans and differential fluids. As far as I know, they haven't been replaced in the last 15 years(i just inherited the car). So i went through the threads on here and the 510 Realm, and followed the vaious links. I read about the possibility of damage resulting from using GL-5 in the transmission, so I was sure to take notes before I headed to O'reily, (the local independent store was closed) When I got there everything was GL-5, except for 140w GL-4 and a O'reily store brand 75/90 GL-5 that said it was safe for GL-2,3,4 and MT-1 . So my question is, can an oil really be that backwards compatible, while not harmful to older components? I am ususually trusting of store brands, but still they aren't the ones that will have to rebuild the whole thing if it blows up. Thanks, Michael