I have an 04XT with 5MT and I need to do a fluid change for front and rear. I don't want to wait for gear oil in the mail. Having said that, the car shifts fine with no grinds or anything. What can I get at advancedautoparts or even walmart that will suit my car? I know I'll need GL-5 and 4 quarts of whatever I get. Will Mobil1 be ok? I read about redline, motul etc. but do I really need that?