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Your Oil drain plug worn out? » Read more about common malfunctions • Repair • Replacement manual
Oil plug & oil seal oil drain plug
The oil drain plug is the point at which the oil from a car engine is drained. It is always located in the oil pan. Whenever changing the engine oil, the oil plug seal should also be replaced as a minimum.
Oil drain plug construction
An oil drain plug is a special screw with an outer or inner hexagon head. It is either made of metal or plastic. Metal screws can be reused. Plastic screws are replaced at every oil change. The oil drain plug is located at the lowest point of a car's oil circuit. This is located in the oil pan, which is therefore usually impressed with an extra funnel, at the center of which is the oil drain plug. This is to ensure that the engine is completely drained of the oil once the oil plug is removed. Yet, the replacement of a standard oil screw made of steel is also a sensible measure: Usually, the factory screws are not magnetic. They do however have one in the oil pan itself. However, an additional magnet on the oil drain plug helps check the condition of the engine.
Defective oil drain plug
Oil drain plugs are hardly exposed to any strains. They must be installed with the correct torque and an intact gasket, then they usually survive a car's life without problems. Yet, if the screw was tightened with too much torque, the thread takes damage. In this case, the screw can fall out at some point, which will go unnoticed. In addition to massive pollution of the environment, this also puts road traffic at risk and will quickly result in total failure of the car.
Another reason for replacing the oil drain plug is replacing the oil pan. The oil pan is priced so low that it is just replaced when replacing the oil pan gasket. The risk of the oil pan becoming warped during its removal is too large to risk any further oil leaks. In this case, the oil drain plug is also replaced. Purchasing oil plug & oil seal oil drain plug Although the oil drain plug is a very simple part from a technical viewpoint, it is important to place the highest value on quality. New oil drain plugs by a brand manufacturer (e.g. Febi Bilstein or FEZ) are technically more reliable than products by unknown manufacturers. At the specified torque, a brand-name product guarantees corrosion resistance and stability. Even magnetic high-quality oil drain plugs rarely ever cost more than 5 euro. Since a vehicle is only equipped with one single oil screw with seal ring, one should not try to save here.
The magnet serves to retain metal shavings in the oil circuit. The oil pan is also provided with a magnet that serves the same purpose. However, it is not accessible without removing the oil pan. Choosing a magnetic oil plug & oil seal oil drain plug allows for effectively checking the engine: Severe chip formation indicates an early engine failure. In this case, it is appropriate to examine the typical places of wear in an engine. Camshaft and oil pump are relatively easily accessible. If there are no signs of scratches, the cause might simply be that the oil change interval was exceeded. In this case, one should recheck the oil after 1,000 kilometers.