Originally Posted by Zyonara91

I use Motomaster ATF for the Corolla PSF, it has done a great job, change the fluid every 40,000 km. However I can remove the return hose and get all of the old fluid out, so that helps.

Let's be real, fluids, conventional and synthetic have come a long way from what they use to be. You can pump your car full of Amsoil, Redline etc if you want, it is after all your wallet and of course you cannot put a price on piece of mind. So if that's what helps you sleep well at night, go for it, no one can stop you.

However, nothing can stump REGULAR scheduled fluids changes, whether you use the best stuff or the over the counter brands.

For the Z I would no go through the hassle of removing all the stuff, just go the suction method.