Ever wonder where your car's engine oil disappears to? If its not leaking oil, its burning it! In this video, the two main reasons why internal combustion engines burn oil are presented and discussed.

The piston crank bearing, connecting rod wrist pin, cylinder walls and valve train are all coated with oil through the engine's lubrication system. Learn more on that in my engine lubrication system video here:

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The first reason cars burn oil is because of worn piston rings, a stuck oil control ring, or clogged piston head. This can likely be attributed to carbon and sludge buildup blocking the oil return holes drilled into the piston head. Sludge and carbon builds up when the petroleum in the engine oil breaks down at high temperature - an engine design defect. The oil has no where to drain, and gets drawn onto the combustion side of the piston where its burned and exits the exhaust.

The second reason cars burn oil is through the valve stem seals. The valves are situated between the well-lubricated cylinder head and combustion chamber down below. When the valve stem seals age, they get dry and crack and may leak oil. Typically overnight, oil pools up around the valve and drips down on to the piston. The next morning upon startup, a huge plume of blue smoke is sighted out of the tail pipe, which is the oil burning away.

Some engines are more susceptible to oil burning than others. The only way to cure oil burning past the rings are to drill holes in the piston heads and change the rings, which requires a full engine tear down. Changing the valve stem seals are still labor intensive, as it requires removal of the engine head and valves.

Here's how an engine works, with disassembly:
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The engine components demonstrated in this video came out of a 2001 Toyota Corolla. It had 204,000 km and burned some oil through the piston rings. The piston ring problem is common on the Corolla, Camry, Rav4, Scion tC, Matrix and Highlander with the 1ZZ-FE and 2AZ-FE engines.

Here's an excellent video on rebuilding the 1ZZ-FE engine:
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