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September 29th, 2008

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Q & A: Transmission Oil

Monday March 18th, 2002
Q & A, MGA, MGB, MGC, MG T-Type, Midget
I have a '68 MGB that I have owned for the las 30 years. I have always used straight 30 wt oil in the transmission because this was recommended to me back in the days when BMC was still alive. Three years ago I rebuilt the engine and installed a later transmission (from a '76) with overdrive. It is approaching the time to chane the oil and I am reading that 20-50 wt is recommended from many sources, and indeed is the recommended viscosity in the original publications. My local MG experts still maintain that 30 wt is the best, and, indeed, I have used it all these years with no problems. What is your recommendation? I appreciate your time in answering this as I have puzzled over this for quite a while.

Thanks again,

Carl Gwyn

CARL!

My first answer is always "Any oil is better than no oil!" The difference between straight 30 and 20W/50 is very little, but the workshop manual DOES ask for engine oil -- which is 20W/50. We've removed auto... read more