Wanted OM15 hydraulic oil

I can still smell it now and I’ve not been near an old aircraft’s hydraulic system for years. Happy days.

We have now got some oil thanks.

Normally I would say yes in some system or other, it depends on how you term restoration and how deep or complete it was carried out, as it prevents corrosion in the systems, it is also used with gas ( normally Nitrogen, again as it is inert so does not cause corrosion like air that contains water) in the legs to keep the struts extended the gas gives compression and the fluid dampens rebound, but then some may simply have a locking collar fitted externally.

As you can see by the red collar on the Me410 at Cosford, this is to give it some form of extension, so one doubts it is charged any more with gas, also it sits on a jack frame to raise the tyre just off the ground to preserve it, and also has a red strut on the gear leg, that is a ground lock to prevent it folding, I do not know how much the systems were restored when it moved to Cosford, but we ran it at St Athans

Also in some items they can be held up by a hydraulic lock, Ie the jack or ram cannot move because the fluid is retained in it by a valve, remove the fluid and they can sag / move. The reason you use a liquid is you cannot compress a liquid, but you can a gas.
If the system has been broken as in say the wings have been removed and refitted in a museum it may not of had the fluid in the system restored, but one of the nightmares for aircraft preservation is keeping corrosion at bay, and one of the best ways to do that is to retain the fluid in the systems that it operated with. Fuel is another thing to consider.

I know that some active warbirds suffered problems because redundant tanks that were used in service started to dry out in civilian life, the sealant and rubber in them used in assembly to seal the tanks perished because they dried out and in some cases fasteners became loose because of that, thus requiring repair where often the tanks had to be stripped down and reassembled minus the sealants.

OK thanks Tony. Maybe another ‘basic’ question, do all static restorations have hydraulic fluid within their systems ? Never considered this before.

It is a mineral based super clean red dyed hydraulic fluid, used in the likes of aircraft brakes, control and Undercarriage systems,

For more read the Aeroshell book hydraulic fluid section here

http://www.shell.com/business-customers/aviation/aeroshell/knowledge-centre/the-aeroshell-book.html

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For the interest of a non techie type like me. What is this oil used for ?

Or DTD 585 or Aeroshell 41.

You want unopened out of date if possible as it is hydroscopic, ie, it absorbs water and diminishes its performance, sadly I do not have any expired stuff, but failing that

http://www.ebay.co.uk/itm/Aeroshell-Fluid-41-1-Quart-Can-/172239752882?hash=item281a4a0eb2:g:5OUAAOSw1DtXD02E

http://www.ebay.co.uk/itm/Aeroshell-Hydraulic-Fluid-41-5-litre-Can-/172240333305?hash=item281a52e9f9:g:SVoAAOSwmtJXXxYM

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We are in need of some hydraulic oil out of shelf life would be OK any body got any leads.

Do you know any service technician who does work on internal transport in warehouses. Reach-trucks and pallet trucks in the deep freeze houses do use an OM15 equivalent (41).
They also change it regularly. You might get some good but used oil for nothing..

Commercial Fluid 41 is what you need.