Why Is My Car Burning Oil So Fast?
Q. I have a 2006 Cadillac SRX with 140,252 miles on it. Within the past two years I have replaced the catalytic converters and since then, the car has been burning oil. Just this week I had an oil change, then hit the road and drove 175 miles and the check engine light came on. I checked it and found the engine had no oil. What could be the problem?
A. The catalytic converter failure is most likely a result of your Cadillac burning oil. The first and simplest check would be to ensure the positive crankcase ventilation (PCV) system is operating properly. If the PCV system is not working properly, this can result in increased oil use. Also, higher than normal engine temperatures, worn piston rings and damaged valve seals can all lead to increased oil use. At this point, I would have a repair shop perform a complete diagnostic check of the engine. This should also include cylinder leak down and compression tests.
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