Could you describe the circumstances and location of the burn?
Hot hydraulic oil can be a very bad burn, particularly on the hands. The best advice I can give is evaluation by an MD in the emergency department. My basic initial treatment of such burns is vigorous irrigation with flowing cool (not cold) water. You need to make sure to use a lot of water as the hot hydraulic fluid tends to stick to the hand. If not properly treated, a burn to the hand can result in contracture: a permanent bending of the fingers so as to limit their mobility.
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