Transmission choices?

[Dyno4mance]

What wieght is RL MTL?...Is it 75/90?

[Stevie30]

Andrew, I found this:


Synthetic Manual Transmission Lubricants
Red Line Oil's MTL and MT-90 are designed to provide excellent protection and improved shiftability for manual transmissions and transaxles, having cured the problem of hard shifting in thousands of transmissions with shifting troubles. How? They have the appropriate coefficient of friction for most manual transmission synchronizers (many gear oils, engine oils, and ATFs are too slippery for proper synchro engagement). And, the wide viscosity of MTL and MT-90 allow proper shifting over the entire temperature range which the transmission will experience. The synthetic base oils used have a very high viscosity index which provides relatively constant viscosity as temperature changes. MTL is a low 70W at very low temperatures and a high 80W, nearly an 85W, at elevated temperatures, providing adequate viscosity to prevent wear and deaden gear noise. MT-90 is a thicker 75W90 version of MTL. The shear stability and oxidation stability of these products are excellent, thus the physical characteristics of Red Line MTL and MT-90 will change little with use.

[Dyno4mance]

Thanks for the info Steve and thanks for the spin in your car yesterday....really enjoyed driving a 325i for the first time....

[ScottL]

You can run any of a number of rear-drive racing transmissions in an E30. Pick one to match the torque and horsepower of the motor and have at it. Dog ring, straight cut, sequential... they all come without bell housings so it's a matter of sourcing a housing to mate with the motor, getting the input shaft dimensions right, choosing a clutch, and mating the output with a drive shaft. Obviously, some shifter work might be needed too....

[Knockenwelle]

These transmissions love MTL. It's a MUCH superior oil on paper for the application, and works better in a trans with some mileage. Its viscosity rating is an SAE 70, but it actually flows about the same as ATF. Like the man said, it's what the doctor ordered.