When I get an M410 for my 164, I'll probably use
some kind of synthetic gear oil in it. I noticed
that the mobil 1 stuff was pretty runny, a tiny
bit thicker than 20-50. It certainly isn't as
heavy as some of the other gear oils that I've seen.
I think the original question was about synthetic
motor oil (which I tried once for a while in my
M400 and which produced quite a lot of brass in
the oil when I drained it) while I'd say that
a good synthetic gear oil is probably not a bad
way to go for these, so long as it is the lighter
version not a heaver differential oil.
chris
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