Can you mix diesel with hydraulic oil?
Can you mix diesel with hydraulic oil? OK, Diesel fuel doesn't belong in the hydraulic oil. The question is how much did you put in there. I don't know the capacity of the hydraulic reservoir. If it's several gallons and you only got a 'splash' of Diesel fuel mixed into it there will probably be no issues. Will hydraulic oil damage an engine? Hydraulic oil is about the same as 1950's engine oil and would be OK to use in an emergency to get you home. If you used it for longer than a few days, you would start to...