Cary's Garage: Citroen Hydraulic Blues

Cary Hubbard
by Cary Hubbard


Here is kind of an odd one for you. I have a ‘71 Citroen D series car and it seems there is an issue finding the Hydraulic Mineral fluid for the system. Do you have any ideas or suggestions for me?



Hello Mark,

What a cool car, probably one of my favorites ever made, and yes, I do have some ideas for you. I have heard from some of my acquaintances that the supply of LHM “Liquid Hydraulic Minerale” has become rather difficult and expensive to source. I know you can get it from Europe, but you will have to pay dearly to ship it to the states. From what I have heard from other sources you can use MIL-H-5606 in a Citroen system. If you were to go that route, I would recommend doing a full system flush, so the MIL fluid is the primary fluid in the system and not mixed. The other option that people have done throughout time is draining and flushing the system and just using automatic transmission fluid. I have known people over the years that have done that but honestly, I have mixed feelings about doing that and don’t really know how much I personally trust it. The MIL fluid is like the LHM with a slightly different viscosity rating. With stuff as important as your hydraulic system in your car I would try my hardest to just find and use the LHM but if that doesn’t work out there are at least options.                                 

This is just my two cents and I would highly recommend doing some reading and educating yourself a little bit about the different fluids before you go full-on making a switch.

Best of luck!

Please email any questions to I don’t normally check the comments so please don’t just leave a question in the comments – please email instead.

[Image: Memory Stockphoto/]

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Cary Hubbard
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  • Rob Rob on Jan 22, 2023

    You may want to try a CaseIH tractor dealership. I worked in the parts department a few years ago, and we used to carry a special brake fluid that was used on some of the older farm equipment. I believe it was mineral based.

  • Wolfwagen Wolfwagen on Jan 23, 2023

    Try IMC/PartsAuthority

  • ED I don't know what GM is thinking.I have a 2020 one nice vehicle.Got rid of Camaro and was going to buy one.Probably won't buy another GM product.Get rid of all the head honchos at GM.This company is a bunch of cheapskates building junk that no one wants.
  • Lostjr Sedans have been made less practical, with low rooflines and steeply raked A pillars. It makes them harder to get in and out of. Probably harder to put a kid in a child seat. Sedans used to be more family oriented.
  • Bob Funny how Oldsmobile was offering a GPS system to help if you were lost, yet GM as a company was very lost. Not really sure that they are not still lost. They make hideous looking trucks, Cadillac is a crappy Chevy pretending to be fancy. To be honest, I would never step in a GM show room now or ever. Boring, cheap ugly and bad resale why bother. I get enough of GM when i rent on trips from airports. I have to say, does anybody at GM ever drive what everyone else drives? Do they ever then look at what crap they put out in style fit and finish? Come on, for real, do they? Cadillac updated slogan should be " sub standard of the 3rd world", or " almost as good as Tata motors". Enough said.
  • Sam Jacobs I want a sedan. When a buy a car or even rent one, I don’t want to ride up high. I don’t want a 5-door. I want a trunk to keep my stuff out of sight. It’s quieter, cars handle better, I don’t need to be at the same height as a truck. I have a 2022 Subaru Legacy Touring XT, best car ever, equipped as a luxury sedan, so quick and quiet. I don’t understand automakers’ decisions to take away sedans or simply stop updating them — giving up the competition. The Camry and Accord should not be our only choices. Impala and Fusion were beautiful when they were axed.
  • Spamvw I think you need to remember WHY the big 2 and 1/2 got out of the car business. Without going political, the CAFE standards signed into law meant unless you had a higher gas mileage fleet, you couldn't meet the standards.The Irony is that, the law made sedans so small with low roof lines, that normal people migrated to SUV's and Trucks. Now we get worse mileage than before.