Ferrari Mailing List: Re: 308 mileage

[Jeff Greenfield (coyote]

Regarding synchrio operation and the weight of the oil ... there are other
factors to consider. 

Yes, the lighter oil might provide adequate lubrication for the synchros
while allowing the transmission to shift well. But, my experience has been
that transmissions that call for a 75w90 (or similar weight gear oil) tend
to be noisy with the lighter oil and could possibly lead to bearing
problems. Granted noise would not be much of an issue in a Ferrari. 

I can't imagine though if you hear the bearings rattling arounnd that it is
good for them ...

All that said, I have not personally tried the MTL in a ferrari transaxle,
and have been using the RL 75w90 NS in my car with no problems. That is not
to say that the MTL would cause any problems as its use was suggested by
others.

YMMV,

Jeff



-----Original Message-----
From: Hans E. Hansen [mailto:FList [at] hanshansen.org] 
Sent: Friday, October 19, 2007 12:16 PM
To: Jeff Greenfield
Cc: The FerrariList
Subject: Re: [Ferrari] 308 mileage

I think that each individual gearbox will require some experimentation.
What works well in one may not in another.

But that said......

Jeff's comment about using MT-90 instead of MTL could
possibly aggrevate syncro issues.  The syncros work better
with thinner oil.  That's why (in general) most of these cars
shift better after you've just run the piss out of them -- the
oil has warmed up and gotten thinner.

Hans.

On 10/19/07, Jeff Greenfield <coyote [at] acme-ltd.com> wrote:
> Interesting ... I was told by at least two different people at Redline
> that the 308 required a GL-5 (hypoid) gear oil. (I now assume that
> this is because Ferrari specified a GL-5 oil in the first place)
>
> Since then I've been using their 75w90 NS with just enough friction
> Modifier to keep the LSD happy and it has been working well for me.
>
> Although I think if i were going to use a  GL-4 oil, I'd probably use
> their MT-90 (basically a heavier version of the MTL).
>
> But, hey what do I know ...
>
> Jeff
>
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