![]() ![]() If that's the case, the higher oil pressure passing through the head gasket can sometimes push past the gasket and into the cooling system. Some valvetrains are fed oil thru feeder passages that run from the block to the head, instead of going thru the lifters and pushrods. If that's oil, he'd also find it on his dipstick, which he said he didn't. That sort of thing will buy you a new radiator pretty quick. OP –– please do not listen to someone telling you to drain it, fill it back up with CLP and run it for an hour. But it looked a lot like the Dexcool sludge that I saw a few times, which was a pain to deal with. If this is a result of mixing incompatible coolants, the sludge should come out with the distilled water and not much should reappear. If the sludge doesn't come out, pressurized and/or chemical flush, then look for oil again. In other words, if there is a immediate oil sheen in the much cleaner water –– possible head gasket leak The reason that I suggested getting it hot and letting the distilled water clean it out was to see how easily the gunk came out and because clean-ish water will show an oil sheen better. That was what the big Dexcool settlement was about –– eating the gaskets. I have seen a few GM vehicles with the Dexcool-gasket problem and the sludge was green. Distilled water will do nothing for the problem. It needs to be flushed out under pressure. If the crud stays put, and you don't have oil use (or coolant in your oil), I could consider an aluminum-safe Cummins flush product, used very carefully, and only as suggested.ĭexcool is orange and your advice is complete incorrect, sorry. I would do this twice, and then use the global stuff as suggested. If it is Dexcool sludge, drain it, fill with distilled water, get it hot, run the heater (this is important) for at least 20 minutes while at operating temperature, then drain it.
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