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What damage can be caused to a truck 4 cylinder Nissan FD35 turbo diesel engine by overfilling it with oil over 30 percent?

Overfilling a truck 4-cylinder Nissan FD35 turbo diesel engine with oil by over 30 percent can cause several problems:

1. Increased Oil Pressure: Excessive oil in the engine can lead to higher oil pressure, putting stress on various engine components, including gaskets, seals, and oil lines. Increased pressure can cause these components to fail or leak, resulting in oil leaks and potential engine damage.

2. Oil Foaming: Overfilling the oil can cause excessive churning and agitation, leading to air bubbles mixing with the oil, resulting in oil foaming. Foamed oil loses its lubricating properties, reducing its effectiveness in protecting engine components. This can accelerate wear and tear and increase the risk of engine damage.

3. Clogged Oil Filter: Excess oil can overwhelm the oil filter, causing it to become clogged prematurely. A clogged oil filter restricts oil flow to critical engine components, leading to insufficient lubrication and potential engine damage.

4. Piston Damage: In severe cases, overfilling the oil can cause the oil level to rise too high, reaching the piston crowns. This can interfere with the proper movement of the pistons, leading to piston ring damage and potentially causing engine knocking or even engine failure.

5. Increased Crankshaft Drag: Excessive oil can increase the resistance or drag on the crankshaft as it rotates. This can reduce engine efficiency and performance and put additional strain on the engine's bearings and other components.

Therefore, it is crucial to adhere to the manufacturer's recommended oil level and avoid overfilling the engine with oil to ensure optimal performance and prevent potential damage.