Ferrari Mailing List: Re: 308 mileage

[Dave Handa (dave]

Jeff, 
I am NOT an expert, but this is the post from Brian Crall on
Ferrarichat.com, a master Ferrari Tech...this is what he says:

Originally Posted by Rifledriver 
My shop is right down the road from Redline and we use their products in the
race cars. I have had many long conversations with them about their products
and their recomendations.
Ferrari specs GL5 gear oils for the transmissions. Due to Ferraris specs
Redline will not officially suggest anything other than GL5 gear oils.
GL5 basically means an oil that is designed for medium to high offset hypoid
differentials. MTL is a GL4 lubricant which means it is designed for medium
to low offset hypoid gears. In the 308, 328, 348, 355 transaxles there are
NO hypoid gears of any type, hi, low, or medium, offset.
I am not ordinarily an experimenter with others cars except in circumstances
where the official way is obviously not working but I have seen MTL used
with great success and zero problems in 308 transmissions since the product
was introduced many years ago. It was also the oil of choice in the
transaxles of the 355 and 348 Challenge race cars with zero problems. Those
transmissions were subjected to greater stresses and heat in one weekend
than most of our transmissions are in a lifetime. I cannot say that however
of the AGIP oil spec'd by Ferrari at the time. One session at the track
finished off several transaxles and we were told unofficially by Ferrari to
quit using it in cars that would see track service. That garbage did remain
the official oil.
I have been using MTL in customer cars that had cronic shifting complaints
for several years including one 85 308 in daily service with over 115,000
miles on it and the owner is pleased to this day how his transmission
performs.
It's great oil. If you have a shifting problem use it.
I would not use it in any transaxle in a 275, 330, 365, BB, BBi, TR, 288,
F40, 550, 456, 360, 430, 612, or 599. Those are all medium offset hypoid
gear differentials and should have GL5 oil.




-----Original Message-----
From: Jeff Greenfield [mailto:coyote [at] acme-ltd.com] 
Sent: Thursday, October 18, 2007 6:56 PM
To: dhanda5 [at] comcast.net
Cc: Ferrari list
Subject: Re: [Ferrari] 308 mileage

AFAIK MTL is the wrong oil for a 308 transaxle as it is not a hypoid  
oil.

Redline 75W90 NS is a better choice with a very SMALL amount of  
friction modifier added to keep the LSD happy.

This is my understanding and is what the people at Redline reccomend.

However, I have not been able to confirm that the 308 requires a  
hypoid oil with any certainty.

You don't want to use an oil that is too slippery as the synchros  
require a certain amount of friction to work correctly. Most gear oils  
have friction modifiers added to them for the differential ... This  
presents a challenge with regard to a transaxle.

YMMV,

Jeff

Sent from my iPhone

On Oct 18, 2007, at 7:24 PM, dhanda5 [at] comcast.net wrote:

> Redline MTL gear oil
> Sent via BlackBerry by AT&T
>
> -----Original Message-----
> From: "philville dejazzd.com" <philville [at] dejazzd.com>
>
> Date: Thu, 18 Oct 2007 19:20:24
> To:dave [at] davehanda.com
> Cc:Ferrari list <ferrari [at] ferrarilist.com>
> Subject: Re: [Ferrari] 308 mileage
>
>
>
>   Michel
>   Have you tried any of the super slippery goo stuff in that tranny  
> yet?
>
>   Does any one on the list have any reccomendation for any that they
>   have used in a gearbox....
>   Philip "Phil" Tegtmeier
>   39 Churchill Drive
>   Elverson Pa 19520
>   610.525.8949
>   And, go to: ... PhilvilleUSA.com
>
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