Jim :
The black sludge is dirt and wear products that have settled out. This
is one of the differences between gear oil and motor oil, motor oil has
additives that try to hold dirt in solution, while gear oil lets it
settle out (or build up on the walls). Probably a good idea to clean it
out, while you're in there; and flush out all of the old oil.
This seems like a perfect place to use your 80W90 to me. That's what I
use (although I buy Valvoline synthetic).
Randall
59 TR3A daily driver
a Wallace wrote:
>
> I do have a question: why is there a layer of black sludge on the casing,
> when the rest of the oil looks the usual oil colour?
> -and is this OK?
> -and can I finally use all this 80W90 gear oil I've had around the place
> for years?
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