What Causes Engine Oil Deficiency?
2 Answers
Reasons for engine oil deficiency include: 1. Aging valve stem seals, where the rubber loses elasticity, leading to poor sealing and oil seeping into the combustion chamber; 2. Cylinder liner wear or insufficient piston ring tension; 3. Excessive clearance between piston rings and cylinder walls, improper piston ring installation, or degraded sealing, reducing the oil control ring's scraping effect; 4. Excessive wear between the valve guide and valve stem, allowing oil droplets from the valve cover to enter the combustion chamber through the gap during operation; 5. Sticking of the crankcase ventilation valve, preventing movement and losing control over ventilation volume, causing excessive oil vapor in the crankcase to enter the intake manifold through the crankcase ventilation pipe.
I've been running an auto repair shop for years, and low engine oil is a common issue. The most frequent cause is oil leaks from points like a cracked oil pan gasket or a loosely installed oil filter – oil stains under parked cars are telltale signs. Another culprit is oil burning: worn piston rings allow oil to seep into combustion chambers, indicated by blue exhaust smoke. Neglected maintenance plays a role too – overdue oil changes lead to degraded oil that depletes faster. Faulty ventilation systems can also cause excessive consumption, as blocked crankcase ventilation increases pressure and leakage. DIY check tips: Measure dipstick every two weeks (wipe clean and reinsert when engine's cold to check mid-level). Use oil-absorbent paper to trace leaks, replacing gaskets or seals promptly saves money and prevents major damage. Once had a customer who delayed repairs until engine seizure – costly lesson. Regular checks extend engine life; synthetic oil reduces consumption. Set phone reminders for maintenance schedules – simple yet effective peace of mind.
