read a few post, it says most people recommend REDLINE gearbox oil.... MT90 or the shockproof, how much are they?? and how much do we need for a 1ZZ corolla? # bottles? some also say Castrol Syntrax 75W-90 is pretty good. I guess it should be cheaper right? But many says its bad when its COLD, is it true?? I work night shift, so the car gets really cold at night... help please