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Q: Why didn't my car show overheating with a blown head gasket? on 2010 Nissan Murano

I was told by my mechanic that I have a blown head gasket on my car with only 30,000 miles on it. I also was told that sludge was beginning to form. Why wouldn't my 'check engine' light go on if the car was overheating? and Why wouldn't I have noticed sludge when changing oil every 3,000 miles? I never had any issues with this car in the 2 1/2 yrs. I owned it. Very disappointed....
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Has got to be some sympotms!! Misfire? Are you loosing coolant? Steam from exhaust? What test was performed to determine that it has a defective head gasket, like maybe a combustion leak test? Any factory warranty left? Has this mechanic been a MECHANIC for long, (experenced)? Need more info.!
The only symptom that happened was white smoke coming from the tail pipe. The engine never made a overheating problems, nothing. The mechanic first ran a compression test or something like that and he also put something in the back by the tailpipe to analyze the smoke. The dealership and company won't even diagnose my car cause they found some sludge. The mechanic looked at the head gasket and told us that maintenance had nothing to do with the blown head gasket. The mechanic has over 10 yrs. of experience and a good reputation. I just find it very odd after reading so many articles about blown head gaskets that my car never overheated...can you explain, in your opinion, why that might be?
You just have not lost enough coolant to cause overheating! That white smoke is coolant comming out of the T pipe.
Hmmmm, the coolant is now down to the very bottom of the container. I don't know...thanks for your opinion tho.
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