Ok, the transmission fluid was fine and I flushed the system out. It wasn't oil but a kinda of weird flaky black #### that mostly disintegrated into a black gunk similar to oil when rubbed. One of the coolant hoses leading directly into the resevoir was a black rubber hose so I replaced that with silicone.
Have some basic maintenance to do, oil and fuel filter change, before taking it out on a test drive. Thank you all for the help you saved me a trip to the shop.
Oil in coolant resevoir after coolant change
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by RunningAces, Jun 8, 2025.
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