[DML] Manual Transmission Gear Oil

["theshovel1224" <theshovel1224@xxxxxxxxx>]

Coming up on an oil change and I thought it would probably be a good
idea to drain & refill the transmission as well, so I have a few
questions.  Looking at the Tech Info and Owner's Manuals, the
recommended MT lubricant is an MIL-L-2105C or API 1 GL-5, SAE 75 for
below -10°C and SAE 80 for above -10°C.  The consensus of the
archives is that a good brand of 90 weight gear oil will work, and
much praise has been given to Redline MTL synthetic.  On the Redline
website (redlineoil.com) it says that MTL behaves like a GL-4 70w80
gear oil. They also have MT90 which is a little thicker, like a GL-4
75w90 gear oil. Redline also has 75w90NS (NS stands for no-slip, for a
non limited-slip differential) which can be used in place of a GL-5
75w90. Here's where the questions come in.

1. If I were to go only on the advice of the 20 year old manuals, the
equivalent Redline oil would be the 75w90NS, but everyone on the DML
who has said they use Redline uses MTL.  Now I know a lot has changed
in gear oil technology in the last 20 years with the introduction of
synthetic oils among many other things, but I just thought I'd throw
that out there.

2. I know with engines, putting a synthetic in an engine that has
always run on regular oils can cause the synthetic to "find" places to
leak out since the molecules are uniform.  My DeLorean has the
characteristic transmission leak (will reseal when it's time to do the
clutch) so will a synthetic make this worse?

Thoughts?


John Yeoman




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