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  #1  
Old 03-07-2010, 06:43 PM
LmnsBlu355's Avatar
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355 soft top correct fluid

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.
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  #2  
Old 03-07-2010, 09:58 PM
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I just use ordinary Hydraulic jack oil from Pep Boys on my 355. Was $5.00 and works great! If your worried about compatability just use up the old fluid before adding the new one. Also make sure you properly bleed the air bubbles. Here is a link you may find helpful:

355 Spider - Convertible Top
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  #3  
Old 03-07-2010, 11:07 PM
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i used hyd/oil from mercedies dealer
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Old 03-08-2010, 11:00 AM
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Purchased the oil from the local Mercedes Benz dealer.

Works fine.
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  #5  
Old 03-08-2010, 11:34 AM
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Ditto and my Ferrari tech. ok'd this fluid as well (*Benz fluid ~ $20/qt)
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  #6  
Old 03-08-2010, 09:37 PM
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Here is the maker of the Mercedes hydraulic top fluid:
http://www.aral-lubricants.com/lubri...amol_zh-m.html
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Old 03-08-2010, 10:39 PM
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Thanks for the info. I've been obsessing over this for the past 24 hrs. A very informative older thread:

'97 F335 Spider Convertible problem

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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