strange oil leak

1064rg

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Here's a little background: last winter my oil cooler was slobbering oil. I removed it, took it to my local psd mech, he rebuilt, I reinstalled. On a cold morning shortly thereafter, but still on the same fuel, it gelled up. I pulled filter, filled w/powerservice, and it started. It sounded horrible, and fogged BLACK smoke, but it ran, and it began to get better, so I went inside, and came back out, and oil was pouring out the front cap of the oil cooler. I shut it off, restarted, and it quit. It did that twice more over the next few days, then quit, until now.
Fast forward to today. Truck has been setting for 4-5 wks, w/ the fuel filter assy removed (hoses were fubared). I started it about 6:00 last night, 38*, and oil was RUNNING out along the rear seam where the oil cooler bolts to the block. I quickly shut it off, and pulled the dipstick, just barely on the stick. filled oil, and restarted, no leak, 10 mile test drive no leak. This morning, 25*, truck gelled; see above remedy. no oil leak. I drove 10 miles, stopped the truck idled for 15ish min, no leak. I then drove .75 miles, and shut off,20 min later there was a big puddle on the ground. This repeated itself several times this morning. If it was running, it wouldn't leak, if I shut it off it would leak. At 5:00, I came home, and there was no leak when I shut it off. WTF
I probably lost .75 gal last night, on my driveway, and .5 gal this morning, at various locations around town.
I hope I didn't confuse anybody, cause I'm confused. Anyone have any ideas what is causing this, and how to fix it. Who knows, it might not do again for another year.
 

95_stroker

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I dont see the relationship between fuel gelling and an oil leak on your oil cooler? Irregardless it seems to me that the oil cooler needs to be pulled off the truck again as the mating surface seems to be compromised.
 

MBRPCrazyford

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Not to get off subject, but you mentioned that your fuel gelled up several times and you removed the filter and filled with poerservice. Why don't you just dump the said amount on bottle into your tank at eack fill up and save yourself some time?? Just my $.02
 

Crumm

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I am with Mike, the oil cooler needs to be removed and resealed. There is obviously a problem with it and it may be worse when the oil is cold. Cold oil makes for more pressure against the seals as flow through the cooler is restricted.
 

1064rg

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on the powerservice, I had summer fuel in, and the truck sat for 4-5 wks. Once, it was started it ran fine. I have since filled up, and added PS to the tank.
About the leak, why does it leak after I shut it off, and not when idle/high idle?
 

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