Thread: type of gear oil?

hey i may about to put my new clutchmaster racing clutch in my car and was wondering what type of gear oil would be best and what wieght (ex.80w-90). any help would be great i have to get this all done this weekend so i have a car to get back to work on tuesday. thanks

Redline MT-90 is my recommendation even for turbo cars.
Others will do Redline Heavy Shockproof trying to get a bit more life out of the transmission.
Others will do some sort of mix of the two trying to get more cushion for the gears (from the Heavy) without a lot of dog teeth grinding (MT-90 lets the synchros work better).

Ok thanks ill pick some up tomorrow

I did one qt of Heavy and rest MT90, and liked it.

I found that straight MT90 tends to thin out too much when driving VERY fast for long periods

Ok thanks for the tip

Depends on what your power levels are and how long you want your trans to last. Ive used several gear oils, MT90, Shockproof both heavy and lightweight, Mobil 1 75w90, conventional 75w90 and last but not least and my current favorite, 85w140 valvoline gear oil.

the 85w140 is by far the best gear oil ive ever used in both the 5 speed trans and the spec v 6 speed trans im now running. Its not soo thick that its a pain in the mornings but it has great shock resistant properties and you can feel it when your driving. Shifts that were once notchy with the thinner oils are smooth as butter. Ive yet to break a gearstack on our 5 speed trans running this oil. I put about 5k miles of absolute torture on my last 5 speed trans with over 500whp and never broke one. Previously running the thinner oils I broke 3 gearstacks within 3 months. Im also running a twin disk clutch so you can imagine the extra shock on the gears during harder shifts.

Ive gotten several people on this forum to switch to it and they have all said its by far the best stuff they have ran in it. That and its cheap at about 3.25 per quart. So just throwing that option out there. Id say for turbod guys its the best stuff you can run if you want to protect your trans and have it last a long time.

ive got some of that to try after I get my bellhousing changed over.
Just waiting on the bearings to get here.

I'm gana try the 75w 90 crown royal purple my buddy liked it for his supra

Wow never heard of that oil setup Ashton, hmmm interesting.. I have to buy trans fluid soon...

I use Coastal 85w-140 in my b14. It whines a bit in 4th and low 5th, but its done that since I got it. A year and lots of tires, 9 runs down the drag, and 6 laps of autocross and it still works perfectly.

Oh, and a 5 gal drum for $35!