What Causes Oil on a Motorcycle's Air Filter?

1 Answers
LaElijah
07/30/25 2:58am
The reasons for oil on a motorcycle's air filter are: 1. If it's a foam sponge filter, a small amount of oil is normal; 2. Excessive oil might indicate that the motorcycle has tipped over, causing engine oil to flow back into the air filter through the breather tube; 3. Check if there is too much oil in the engine or if the cylinder gasket is damaged, as both can lead to oil in the air filter. Engine oil is often referred to as the lifeblood of the engine. Without oil, the engine cannot function properly. During operation, the oil forms a protective film on the surfaces of engine components, preventing direct contact and friction between them. If components rub directly against each other, it can generate excessive heat instantly, which is detrimental to the engine. Over time, the performance of engine oil deteriorates, so it's essential to change the oil regularly to keep the motorcycle in optimal condition.
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