Message text written by "R. Ashford Little II"
>Much confusion in my head about this. Apparently the original A-type
manual
recommends using 30wt engine oil whereas most people these days seem to use
the more typical 80-90 wt gear oil. This seems like a large difference in
viscosity so I was hoping that some of you can add your opinion to further
confuse me.
<
It does seem like a large difference in viscosity but in actuality, it
isn't. Oils are rated at the expected operating temperatures and engine
oil is rated at a higher temperature than is gear oil. Hence the higher
numbers for gear oil that is actually fairly close to motor oil in
viscosity.
If you can find GL4 rated gear oil, use it. GL5 has a higher level of
sulpher compounds which has the potential of accelerating the wear of the
brass parts in the transmission. Gear oil is a rather complex collection
of additives and I'll leave it to others to explain the details.
Personally, I use 30W non-detergent in the TR3 and Red Line MTL in the TR6
(synthetic). Just remember, anything is better than nothing.
Dave Massey
57 TR3 (30W non-detergent)
71 TR6 (Red Line MTL)
80 TR8 (ATF)
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