Shut off my truck, and see this five minutes later. Truck has never done it before. Usual couple drips of oil after a trip, but that's it. This puddle is about eight inches in diameter. Visually, it looks like hydraulic fluid, or a puddle of brand new engine oil.
When you touch it, it kind of feels like oil, but runs off your fingers like water. Doesn't smell like diesel. Really, it doesn't smell like anything but faint smell of oil.
I checked my oil, and it's regular black like normal. Fired up the engine, and blow by is dry. Doesn't feel moist like burning off water condensation. Any ideas? CM870.
Blow by tube mystery liquid
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by God prefers Diesels, Jan 4, 2021.
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Taste it
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Is there some way to get coolant out the road draft without it mixing with the oil? I mean that's right in front of the gear train, and a direct path to the crank case.13 Speed Road Ranger, truckdriver31, Farmtractor9900 and 2 others Thank this. -
Send off for an oil sample if you want to know for sure.
Could be bad EGR cooler, head gasket bad liner maybe even a trans cooler.truckdriver31, Brandt, D.Tibbitt and 2 others Thank this. -
Just popped open my surge tank to look inside. Clean. Took a tiny taste, and doesn't taste anything like what's on the ground.
Truck sat for about a week and a half. Not sure what difference that could make. I've been around engines with blow by tubes for twenty years, and I've never seen anything come out of them but oil.truckdriver31, D.Tibbitt and Rideandrepair Thank this. -
@bigtravelr I just had the oil sampled a couple thousand miles ago. No coolant, no diesel. Not even trace amounts. If something's broken, then it just broke.
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When the egr cooler started leaking on the one I had it puked coolant out at the egr valve.
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Last edited: Jan 4, 2021
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