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Cliff Biggs
New User
Username: cliffy

Post Number: 33
Registered: 09-2021
Posted on Saturday, 25 June, 2022 - 08:26:   Edit PostDelete PostView Post/Check IP

I read somewhere that someone had found a good substitute for our (green) mineral hydraulic oil

Anyone hear or read anything about that also?
Trying to remember where I read it
Just curious about the idea.
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Brian Vogel
Grand Master
Username: guyslp

Post Number: 3294
Registered: 06-2009
Posted on Sunday, 26 June, 2022 - 05:26:   Edit PostDelete PostView Post/Check IP

One place is the table entitled, Miscellaneous Hydraulic/Braking System Mineral Oil Based Fluids and Their Properties, in the RR & Bentley Parts, Repair, Restoration & Other Resources Compilation

Brian
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Cliff Biggs
New User
Username: cliffy

Post Number: 35
Registered: 09-2021
Posted on Monday, 27 June, 2022 - 13:33:   Edit PostDelete PostView Post/Check IP

In searching the list I come to find that the oil mentioned is no longer manufactured but the replacement is-

TRW Hydraulic System Mineral Oil LHM Plus
@ $23-$30 per quart

Hyd leaks will be expensive if not fixed!
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Mark Aldridge
Frequent User
Username: mark_aldridge

Post Number: 791
Registered: 10-2008
Posted on Tuesday, 28 June, 2022 - 09:16:   Edit PostDelete PostView Post/Check IP

Ouch ! in the Uk it is about £30 ( about $36 ) for 5 litres
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Brian Vogel
Grand Master
Username: guyslp

Post Number: 3295
Registered: 06-2009
Posted on Tuesday, 28 June, 2022 - 09:35:   Edit PostDelete PostView Post/Check IP

See also the very long topic on RollsRoyceForums.com: https://www.rollsroyceforums.com/threads/mineral-system-oil-where-to-source.3825/
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Cliff Biggs
New User
Username: cliffy

Post Number: 43
Registered: 09-2021
Posted on Thursday, 14 July, 2022 - 10:07:   Edit PostDelete PostView Post/Check IP

Read the entire topic
Thanks
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Darryl Watson
Experienced User
Username: inox

Post Number: 175
Registered: 04-2015
Posted on Monday, 01 August, 2022 - 00:24:   Edit PostDelete PostView Post/Check IP

Hi Cliff,
Don't forget that a lot of post DS / pre C5 Citroens used LHM fluid.
Don't know if there are many Citroens in your part of the world.
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Brian Vogel
Grand Master
Username: guyslp

Post Number: 3302
Registered: 06-2009
Posted on Monday, 01 August, 2022 - 02:45:   Edit PostDelete PostView Post/Check IP

This topic has made me go back and revisit the one I linked to, as well as making additions to the hydraulic mineral oils properties table in the RR & Bentley Parts, Repair, Restoration & Other Resources Compilation.

Anyone marketing HSMO+ or LHM+ has a product that is the same thing. There are several sources I consider reliable who have stated that the source factory for these various products is the same one.

Even two Pentosin CHF formulations should be perfectly adequate for the task.

It's also pretty clear that if the product states it conforms to either one or both of the following specifications, ISO 7308 and CitroŽn/Peugeot PSA B71 2710, it's perfectly OK for use in the cars that require HSMO+.

Several of the various spec sheets explicitly state something along the lines of, "Certain CitroŽn/Peugeot (PSA B71 2710), Rolls-Royce
& Bentley models."

CitroŽn, RR, and Bently all eventually went to hydraulic systems using hydraulic system mineral oil with separate braking systems using conventional brake fluid. Hence the "certain" as some use it for braking and hydraulics while later cars do not. We all know that hydraulic mineral oil and DOT3/4/5.1 brake fluids do NOT mix!

Brian

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