This waiting period is essential for maintaining the correct viscosity and film strength within the lubrication system. Understanding Oil Addition Best Practices For the vast majority of passenger vehicles, the recommended procedure is to turn the ignition off and wait for the engine to cool down before adding oil.
Understanding Oil Pump Pressure While the Engine Runs
For the average driver, the risk of splashing hot oil on hands or arms while the fan is running presents a significant safety hazard that outweighs the convenience of adding oil while the car is in motion or idling. You might assume the pan is low, but the actual level could be significantly higher, leading to the dangerous overfilling of the crankcase.
Cold oil is denser and settles differently than hot oil, which expands when heated. This design keeps the oil pan clear of churning oil, theoretically allowing for addition while running.
Understanding Oil Pump Pressure While the Engine Runs
When the engine is running, the oil pump is actively pressurizing the system and circulating fluid through the galleries, bearings, and oil filter. This foamy mixture is detrimental because it cannot maintain proper lubrication.
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