[Fot] Differential oil

[jim hearn]

I am changing parts in the differential of my '74 TR6.  I don't know what
oil is in it now but I have some Valvoline 85 w - 145 w.  I'm autocrossing
or tracking (no street driving) mostly in hot weather.  Is the 85w - 145w
suitable or is it possibly too heavy for good performance?

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