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What causes the C4L 1.8 to burn engine oil?

2 Answers

Kate

07/25/25 5:57am

The reasons for the C4L 1.8 burning engine oil include excessive carbon deposits, corrosion and aging of valve stem seals, and damage to seal components. Excessive carbon deposits: Excessive carbon deposits accumulate in the piston grooves, causing the piston rings to stick together and become jammed, preventing them from sealing completely. The 'stuck' piston rings significantly reduce their oil-scraping and sealing capabilities. This also exacerbates wear between the pistons and cylinder walls, creating excessive clearance that allows engine oil to enter the combustion chamber. Corrosion and aging of valve stem seals: Corrosion and aging of valve stem seals result in poor sealing. Valve stem seals are vulnerable components prone to aging. Aging of crankshaft seals: Aging of front and rear crankshaft seals occurs as they are continuously exposed to large areas of oil. The impurities in the oil and temperature fluctuations within the engine gradually weaken their sealing effectiveness, leading to oil seepage or leakage.

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Cook

08/10/25 5:58pm

I've driven quite a few cars, including the Citroën C4L with its 1.8L engine. Oil burning is quite common, mainly caused by piston ring wear or aging valve stem seals, where oil leaks into the combustion chamber and burns. The symptoms include blue smoke from the exhaust pipe and a sudden increase in oil consumption. My car started having this issue after running about 70,000 to 80,000 kilometers, and it turned out to be leaking valve stem seals. Fixing it costs some money, but don't delay, or it could damage the engine. I recommend changing the oil regularly, avoiding aggressive driving, and checking the oil level periodically. If symptoms appear, take it to the shop immediately. Ignoring it could lead to increased fuel consumption and even damage the catalytic converter. You can also buy a simple oil consumption tester to monitor the rate yourself—it's cost-effective and gives peace of mind.

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