Next dumb question. Somebody put in a 90 degree corner so I can't see how much fluid is in the case, but I can't feel anything so I'm guessing it's a little low. I have 2 quarts of Valvoline Hi performance sae 75W-90 gear oil. It says it's ok for transmissions that use API GL-5 or MT-1 fluid. I have no idea what's in the case now, but will it be ok to use this with whatever is in there now? I'm going to replace the fluid pretty soon, but I don't want to cook the trans before then.