When an engine is turned off, these components cool down and contract. However, this constant thermal cycling puts immense stress on rubber and composite seals.
Older Car Oil Leak Corrosion: How Engine Stress and Seal Damage Cause Leaks
Over time, the intense heat within an engine, combined with exposure to oil additives and general wear and tear, causes these materials to harden, crack, or shrink. The most frequent offenders are the valve cover gasket, which sits atop the engine and seals the area between the cylinder head and the rocker cover, and the rear main seal, which prevents oil from escaping where the crankshaft exits the engine block to connect with the transmission.
Even the simple act of repeatedly tightening and loosening a drain plug during oil changes can cause the metal threads to strip, preventing a proper seal and leading to a consistent drip. Understanding what causes oil leaks in cars requires looking at the age of the vehicle, the maintenance history, and the specific points of failure within the lubrication system.
Oil Leak Corrosion in Older Cars: How Engine Stress and Seal Wear Cause Leaks
This increased pressure seeks the path of least resistance, often forcing oil past the gaskets mentioned above. These components are designed to contain oil under pressure while allowing moving parts to function freely.
More About What causes oil leaks in cars
Looking at What causes oil leaks in cars from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on What causes oil leaks in cars can make the topic easier to follow by connecting earlier points with a few simple takeaways.
