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Message: [QUOTE="protraxrptr17, post: 403252, member: 3917"] Customer of mine bought this truck not running. Got a vague description from the previous owners (it was a company delivery truck). Mostly said it was getting oil in the coolant. I found that it was actually getting diesel in the coolant. I pulled the injectors and found 6 cups cracked. I replaced the cups, and drove it a couple days and let him have it back. I noticed some watery globules on the underside of the valve covers, but they said the truck had been sitting for a few years, so I thought maybe it was condensation. Customer drove the truck for a couple weeks and called me saying that the OD light was flashing and wouldnt shift into OD sometimes. I told him to bring it in and I would look it over. He brings it and a couple days later I go out to start it up, and it kinda acts like its hydrolocked. I checked the oil, and its way overfull with coolant mixed in. Really low on coolant also. Drained the oil and had a large amount of clean coolant in the bottom of the pan. I pulled the injectors and pressurized the coolant again. No leaks anywhere. Let it sit for 4 hours with 15psi. No coolant lost. Not a drop in the cylinders. None coming from oil pan. Even marked the reservoir before I started. Still exactly on my mark. I looked in all the cylinders with a borescope and all the pistons were black. No clean ones. I pulled the water pump and there was a trace amount of oil coming from the port on the upper drivers side behind the pump. Could it be the oil cooler? There is much more water in the oil than there is oil in the water. Its puzzling to me because I couldnt get it to leak with the pressure test. What should I do next? [/QUOTE]