Medium and Heavy Trucks
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Unfortunately this often indicates the presence of coolant in the engine oil. I have seen this many times. Whenever oil and coolant come together. They become this gray colored substance.
There are four places I have seen the coolant come from. A failed water pump, seal leak at a cylinder liner, a head gasket leak, and a faulty oil cooler.
To test I like to drop the engine oil pan and pressurize the cooling system. You will be able to see where the coolant is leaking from.
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No never on the water pump. But most often it does on the oil cooler. Most oil cooler failures cause oil in the coolant only. But on some rare occasions, it will put only coolant in the oil. It's rare but is see it from time to time.
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