355 soft top correct fluid

Discussion in '348/355' started by LmnsBlu355, Mar 7, 2010.

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  1. LmnsBlu355

    LmnsBlu355 Formula Junior
    Silver Subscribed

    Dec 28, 2009
    Full Name:
    Jordan S.
    I need to add fluid to my 355 soft top reservoir. I've done a search and info here is not 100% clear.

    I have a liter of Pentosin CHF 202 which is a synthetic. It says it is compatible with Pentosin CHF 11 (Both are synthetic). It is NOT compatible with Pentosin CHF 7.1 which is mineral based.

    I've seen on this forum rec's to use ordinary hydraulic jack oil (which I assume is mineral based) and rec's to use "Pentosin" but no info on exactly which formula.

    Does anyone know the correct specs for the fluid to add to original? I don't want to mix incompatible fluids.
  2. FerrariDeeJay

    FerrariDeeJay Formula Junior

    Jun 2, 2009
    Corona, CA
    Full Name:
  3. rizzo308

    rizzo308 Formula 3
    Silver Subscribed

    Sep 12, 2004
    perth, australia
    Full Name:
    i used hyd/oil from mercedies dealer
  4. f355jimv

    f355jimv Formula Junior

    Jan 21, 2008
    Southern California
    Full Name:
    Purchased the oil from the local Mercedes Benz dealer.

    Works fine.
  5. mike_747

    mike_747 Formula Junior

    Dec 15, 2008
    Ditto and my Ferrari tech. ok'd this fluid as well (*Benz fluid ~ $20/qt)
  6. f355spider

    f355spider F1 World Champ
    Rossa Subscribed Owner

    May 29, 2001
    Seattle, WA USA
    Full Name:
    Hugh G. Rection
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  8. LmnsBlu355

    LmnsBlu355 Formula Junior
    Silver Subscribed

    Dec 28, 2009
    Full Name:
    Jordan S.
    Thanks for the info. I've been obsessing over this for the past 24 hrs. A very informative older thread:


    In summary:
    Ferrari Original Fluid: Esso UNIVIS J26 hydraulic oil
    Recommended alternative: Mercedes ZH-M (a.k.a Aral Vitamol ZH-M)

    I'll be stopping by the MB dealer in the a.m.

    I still don't know if all this really matters but would feel really silly if I added Pentosin CHF 202 or AW32 generic hydraulic fluid (both here in my garage) and developed a leak or ruined a hyd. ram.

    Thanks again.

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