348 Help! This gear oil doesn't look right

All I could find in the books was "ZF lamellar self-locking differential" with 40% lock.

FChat tells me there are no hypoid gears of any kind in the transaxle, which may help with oil selection.

 

I read the same thing about no hypoid gears, however the type or material of synchro rings may be an issue with certain oils. I forget what exactly but it s out here somewhere.

 

Nope I am using " SHELL SPIRAX S5 ATE 75W90 " Spirax S5 is the only Ferrari approved gearbox oil for many Ferrari's. Works very well. Many people don't use it because its expensive and or hard to find, which its not actually, or assume there is some other secret oil out there. Its sort of fun to search for it.

What's tricky with our cars is the GB is hand made so tolerances are different and some oils work well in one GB but not in other GB's.

 

I use CASTROL- without any problems.....recommended.

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Fantastic, would be good to hear others if they use it!

 

And it's a GL4 which the 348 calls for in the specs. Keep us posted.

 

Lol

 

Well, I already bought the Redline 75W90NS. For what it is worth, Redline specifically says this oil cross references with the Spirax S5 ATE 75W90. And the Shell comments on their oil hint at it being heavily based on esters which the Redline is also. I will see how it goes. If I get any binding I will add some Lubegard friction modifier. I already have that on hand and Lubegard is also a great product. Next time I may try the Spirax and directly compare.

And I agree on the tolerances. It is similar to what I said about mileage and wear being a factor. As these age, more bite will be needed.

 

I guess you will find out. Best bet is what your doing, try what you have, you can always change it, maybe its amazing for you.
I am in Central NJ, come down and try mine.

 

Every Ferrari trans since the 308QV and BB have oil pumps. The pump is not there for the purpose of pushing oil through the cooler.

Even Daytonas and 330 GTCs had oil pumps in the gear boxes.