While it is common knowledge that running low on oil is dangerous, many drivers do not realize that having too much oil creates its own unique set of problems. This process forces pressure to build inside the crankcase, a condition known as "crankcase pressurization.
How Overfilling Motor Oil Causes Rear Main Seal Failure
Diagnosis and Correction If you suspect you have overfilled the engine, the most immediate step is to check the dipstick. " High pressure forces oil past seals and gaskets that are designed to handle only standard operating pressures.
Oil Consumption: You may notice blue smoke billowing from the tailpipe as oil burns in the combustion chamber. Mechanical Stress and Pressure The Crankcase Pressure Issue When an engine is overfilled, the rotating crankshaft churns through the excess oil, creating aeration and foam.
Rear Main Seal Failure Caused by Overfilling Motor Oil
The result is often a leak that resembles a messy drip rather than a simple spill, and the stress on these components can lead to premature failure. The most frequent cause, however, is simply adding oil until the dipstick hits the "Full" mark without stopping, not realizing the level continues to rise as the new oil drains from the filler neck.
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