Now im bumping this thread a bit.
I have the same problem as murph on my Rb25det
my gearbox throws up oil from the breather, i have also redline's shockproof lighweigt oil.
it startet last year and it keept throw up even when i changed the oil so it maybe was a bad batch.
and for this year i bought a second gearbox and the redline oil, keeps throwing up oil from the breather
What is the problem?? Is it the oil,? it must be becaus the guy i bought the second gearbox from had no leaks.
Regards / Anders