I was wondering if anyone could fill me in on the proccess to serviceing the oil in the fuel injection pump. What type of oil,the weight of oil, and how much. This is the first one of the pumps I have encountered and I want to make sure it is up to par before I take it back to my buddy. I noticed the dipstick on the pump but I never noticed a drain or fill plug. Any info anyone could give me would be greatly apreciated!!