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Inside the engine, bearings (camshaft, rod and crankshaft) float on a thin film of oil. The viscosity of the oil is high enough that the bearings never actually touch the crankshaft or camshaft. The oil is pressurized to force it into the space between the bearing and the bearing "journal".

If the oil pressure diminishes below a specific level it may not be forced into the space between all of the bearings, potentially leaving one or more of the bearings without lubrication.

It doesn't take many miles of operation with low or no oil pressure before the engine is severely damaged.

The blinking oil pressure light indicates that the engine oil pressure is dangerously low.

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