The engine oil has reduced drastically without any leakage. What might be the possible cause of the problem
My car has 137000 miles.
My car has an automatic transmission.
Hi. The most common cause of this problem is worn internal engine components. The engine's valve seals could be leaking oil into the engine. The engine would then burn the oil, causing oil consumption without any external oil leaks. Worn-out piston rings could cause this as well. You can try using oil additives designed to slow engine oil consumption to help with this problem, or you can use a thicker oil in the engine. Higher mileage vehicles tend to burn 1 to 2 quarts of oil every 1000 to 1500 miles; this problem is not uncommon for high-mileage engines. If you'd like to enlist some professional help with this issue, you can always contact a certified technician, such as one from YourMechanic, to diagnose and repair your oil consumption problem for you.
Have a car question? Get free advice from our top-rated mechanics.
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%