Shimano disk oil

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I have just set up an offroad touring bike with shimano disks, and would like to know the specification for the shimano mineral oil in case I need oil in some out of the way place.
I would guess it is some sort of light weight hydraulic oil but would like exact specs if anyone knows them?

Just find a Shimano dealer, and buy Shimano Mineral Oil. It's red, they only make one type.

http://www.chainreactioncycles.com/Models.aspx?ModelID=5620

You can only use mineral oil in Shimano brakes. Don't use regular automotive brake fluid or you'll need to replace all your brake lines and seals... expensive. <erk!> And potentially fatal in the case of brake failure.

However, if you have Hayes brakes you can only use DOT 3 or DOT 4 automotive brake fluid. Use mineral oils and you'll need to (you guessed it) replace all your brake lines and seals.

Read the instructions for your brakes and pick up a bottle of the right oil for your brakes, and a universal brake bleed kit. Brake bleeding is not rocket science - so long as you're careful not to mix up your oils!