Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.
MIL-H-5606 / MIL-H-23282
They are aviation hydraulic fluids. If you google them, you can buy them from aviation suppliers online. You can often pick them up in the shops at small airports too.