348 - Help! This gear oil doesn't look right | Page 2 | FerrariChat
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348 Help! This gear oil doesn't look right

Discussion in '348/355' started by Huskymaniac, May 23, 2021.

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  1. Qavion

    Qavion F1 World Champ
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    #26 Qavion, May 26, 2021
    Last edited: May 26, 2021
    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.
     
    308 GTB and Bertil like this.
  2. Ferrarium

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    #27 Ferrarium, May 27, 2021
    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.
     
  3. Ferrarium

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    #28 Ferrarium, May 27, 2021
    Last edited: May 27, 2021
    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.
     
  4. heinz_r

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    #29 heinz_r, May 27, 2021
    GTO Joe likes this.
  5. Ferrarium

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    #30 Ferrarium, May 27, 2021
    Fantastic, would be good to hear others if they use it!
     
  6. GTO Joe

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    #31 GTO Joe, May 27, 2021
    And it's a GL4 which the 348 calls for in the specs. Keep us posted. :)
     
  7. AceMaster

    AceMaster Three Time F1 World Champ

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    #32 AceMaster, May 27, 2021
    Lol
     
  8. Huskymaniac

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    #33 Huskymaniac, May 27, 2021
    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.
     
  9. Ferrarium

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    #34 Ferrarium, May 28, 2021
    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.
     
  10. Rifledriver

    Rifledriver Three Time F1 World Champ

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    #35 Rifledriver, May 28, 2021
    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.
     
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