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What would cause oil in air filter 2002 Toyota tacoma?

1. Overfilling the engine with oil. This is the most common cause of oil in the air filter. When the engine is overfilled, the excess oil can get sucked up into the air intake system by the PCV valve.

2. A faulty PCV valve. The PCV valve is a small valve that regulates the flow of air and oil vapor between the engine and the air intake system. When the PCV valve fails, it can allow too much oil vapor to enter the air intake system, which can cause oil to accumulate in the air filter.

3. A damaged or cracked air filter housing. If the air filter housing is damaged or cracked, it can allow unfiltered air to enter the engine. This can cause dirt and debris to build up in the air filter, which can eventually lead to oil contamination.

4. A dirty or clogged air filter. A dirty or clogged air filter can restrict airflow to the engine, which can cause the engine to run rich. This can lead to excess oil being deposited in the air filter.

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