I have a copy of an old Standard Motor Company service manual (pre J type) for
Laycock de Normanville overdrives. It specifies 30 wt non-detergent oil.
It
specifically says not to use extreme presuure gear oils as the
"centrifugal
effect of the planets may separate some of the additives of the
oil and cause
sludging."
That is definitive advice.
However, In my 6 I have
Redline MT90 in my A type and I get compliments on how
well it works. I'm
not switching.
Bruce Simms
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6pack@autox.team.net
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