What to Do When a Urea-Fueled Vehicle Emits Blue Smoke?
2 Answers
Emitting blue smoke is primarily caused by the engine burning engine oil. Engine oil can enter the engine through various pathways and burn inside, causing the vehicle to emit white smoke. When adding engine oil in the future, avoid overfilling. However, if the vehicle continues to emit blue smoke, it should be handled with caution, and the engine should be thoroughly inspected at a 4S shop.
I've been driving diesel vehicles for over a decade and have encountered blue smoke issues before. Blue smoke indicates that engine oil is being burned in the combustion chamber, which could be caused by worn piston rings, faulty valve seals, or oil leaks from the turbocharger. The urea injection system is for emission control and not a direct cause, but engine problems can affect the entire vehicle. My advice is to stop the engine immediately and avoid further driving, as continued operation may lead to more severe damage. First, check the dipstick to see if the oil level is too high or if there's foaming; if there's excess oil, try draining some. Monitor the exhaust pipe—if blue smoke persists, the issue is serious. You can briefly inspect turbo piping for oil stains, but don’t attempt to dismantle the engine. Contact a professional repair shop as soon as possible for proper diagnostic tools to identify internal problems. For prevention, regular oil changes with high-quality lubricants and routine engine wear inspections are crucial. Don’t underestimate this issue—delaying repairs could result in costly overhauls.
