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2000 GMC 4x4 1500 w/ 190K; solid truck; no oil burn; no leaks (that I can see); tediously maintained; Mobil 1 for last 40-50K.

At this oil change, oil came out "muddy" and with some lumps at bottom of stream. I surely figure that this must be coolant in the oil as it "eats" about a pint every 2K. Had water pump replaced about 10K ago.

Any experience in this? Is this likely a head issue? Should I consider replacing engine rather than just heads?

Best regards,

--Bryant
 

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wont be intake leak if it has a 4.8, 5.3, or 6.0. those dont run coolant through the manifold. they use bypass pipes.

we had one in a couple weeks ago, one of our guys did a head job on it, had coolant in the oil, sent the heads out to pressure test and rebuild, and put new gaskets on it. this was like 6 months ago maybe. well couple weeks ago, it came back in for the same problem. needed a engine. only other thing it could be. so we put a new engine in it, ok now of course.

yes it could be a head gasket, the trucks are known for it, it happens. i would pressure test it and see if it is coming inside anywhere, drain the oil, pressure test it.
also, do you have any oil in the coolant?
 
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