[DML] Re: Manual Transmission Gear Oil

["Dave Swingle" <swingle@xxxxxxxxxxx>]

I called Redline's engineering department and asked them. Since this 
is a transmission AND an drive axle, it's a compromise. What's best 
for the differential gears may not be best for syncros. At any rate, 
the recommended oil is 75W90-NS. The MTL is probably not good enough 
for the differential, and 75W90 (not NS) would be too "slippery" for 
the syncros to operate properly. 

And yes, my formerly slightly leaky transmission is now more leaky 
due to the thinner oil. 

Before this I was running Valvoline synthetic 85W90. Other than the 
leaking, I can't say that I can tell a difference. They cost about 
the same. 

Dave Swingle

--- In dmcnews@xxxxxxxxxxxxxxx, "theshovel1224" <theshovel1224@xxxx> 
wrote:
> 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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