GL-4 race car transaxle

[oliver88]

I am racing a Porsche 944 which specs a GL 4 lube. Currently i am using Redline MT90 and it has been OK as far as i can tell. Car has a limited slip and factory transmission lube cooler. I have been concerned that the MT90 is relatively thin...Would I be better off with another GL 4 lube like Amsoil MTG or should i try a GL 5 lube in a heavier grade? I know plenty of people who have run GL 5 in theses cars for years, never a problem with them.

 

[mechtech2]

Mt 90 is relatively thin compared to what?

 

[Steve S]

MTL is a wee bit thicker than an ATF and MT90 is similar to a 75w-90 oil. Call Redline at 1-624-7958 they like their customers. Nice car!!!

 

[aquariuscsm]

Afaik,MTG is a lil thinner than MT90. Don`t go thicker than a 75W90 or you`ll get gear crunch.