Amsoil is awesome for engine oil and filtering. With the grinding synchros in the Z32 it don't seem to help much tho. If I were to buy a brand new Z32, the 1st thing I'd do to it would be to put Redline in the tranny without a doubt. It's not fun dealing with those suckers grinding. When I ran my 12.7 I grinded 3rd and 4th both and it just made me sick. You build and tune a car for some good power and can't use it cause it won't go into gear on it's 1st attempt!!!!!! It's not that the Amsoil's tranny fluid sucks, it just don't help the gear grind much. I ran Amsoil in my tranny for 1-1/2 years.