On 18 Apr 1997, Ken Streeter wrote:
> Do NOT use a GL5 oil, as this is corrosive to the brass
> components in the gearbox. This is the gear oil that
> you will find all over the place.
> If you have a leak-free gearbox (or deeper pockets)
> you may want to go to a synthetic gear oil.
I have heard no indications that synthetic gear oil will cause more leaks
than non-synthetic. FWIW, my own experience confirms this.
The extra cost per year should be easy enough to calculate - a dollar or
two? An expense I would definitely recommend if you ever use your car in
cold weather conditions.
While it is true that synthetic oil in an old *engine* may cause more
leaks, this is due to factors that have little relevance to the condition
in a gearbox.
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