Mike,
DON'T use 90 wt oil in the OD unit!!!!! You are correct in using 20w50, but you
must remember that these components were designed with tolerances for that
weight
engine oil and usually Castrol. The synthetics are fine, but in my limited
experience (and boy am I gonna catch it from the list on this) since synthetics
were not around when MGs were designed, I would not think it prudent to use them
in your car under any circumstances. Stick to Castrol 20w50 and you won't go
wrong.
Michael Ohleger
67 MGB
70 MGB
61 MGA
Neon20sohc@aol.com wrote:
> I read in the owners manual that engine oil should be used in the overdrive
> transmission on my MGB GT. This is my first MG and was wondering if I should
> use the standard 90 W used in every other manual in the world or 20W50
> synthetic engine oil?
> Help!!!!
> Mike Poe
> 1974 1/2 MGB GT
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