Well, shame on me. I shoulda checked my lubricant bottle collection;
Earl is absolutely right.
I use MT-90 in the gearbox-O/D, and Redline 75W-90 gear oil in the
diff. I also had good
results with 20W-50 motor oil in the gearbox, so I chose MT-90. I
wasn't really expecting
a difference--I switched to synthetic for the protective qualities--and
was pleasantly surprised
that shifting was smoother and the O/D engaged a little quicker.
Ned, please note this correction.
bs
ps. Have no clue why my previous posts didn't come through ... I'm
following all the
rules. Must be something embedded in one of the messages.
Earl Kagna wrote:
>Bob:
>
>With respect, I don't know if you should be using MT90 in your diff. MTL
>and MT90 (slightly heavier) have friction enhancing additives which is why
>they work so well in manual transmissions and manual transaxles, and
>especially in the Healey's gearbox/overdrive unit with it's cone clutch in
>the overdrive.
>
>The factory recommended 10 / 30 engine oil in the Healey gearbox/od unit,
>and MTL is probably very close to that. A lot of us have used 20 / 50
>engine oil - slightly better protection in hot weather - MT90 is about as
>close as possible to that - either seems to work quite well, as you have
>discovered.
>
>Again with respect, I would go with a proper gear oil for your diff -
>Redline synthetic or otherwise, lest you invite premature wear in your diff
>gears. Anything equivalent to a good quality hypoid gear oil is what is
>wanted.
>
>A visit to www.redlineoil.com will interest you.
>
>Earl Kagna
>Victoria, B.C.
>BT7 tri-carb
>BJ8
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