Supposedly ALL M42's / Getrag 240's use ATF. However, I have run RedLine MTL for a very long time, and more recently RedLine MT-90 GL4 oil to quiet down the noisy input shaft (thank you, lightweight flywheel). If you find that it is hard to get into gear on cold mornings or the shifts just feel nasty, consider the MTL or MT-90. Otherwise you should be fine.