On 20 Apr 1997, Dean Mericas wrote:
> I too have found it difficult to locate a local source of Redline sythetic
> transmission oil. However, I did find that Mobil-1 has a synthetic 90 wt.
> Can anyone comment on its suitability for TR transmissions?
The synthetic gear oil is available in GL-4 and GL-5 specs. According to
the information I got from Mobil, they would recommend GL-4 if the
gearbox is equipped with an overdrive. This is due to concern that the
GL-5 high-pressure additives may cause slippage of the O/D cone clutch.
Without an O/D, you can use either. At least assuming your car is 1960
or newer.
(There *may* be materials in some 50s and earlier boxes that *may*
conflict with GL-5 - I really don't have any accurate information).
Egil
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