* Cracked or Worn Fuel Injector(s): This is the most common cause. A cracked or worn fuel injector can allow raw, unburnt gasoline to leak directly into the engine's cylinders. From there, it can pass past the piston rings and into the crankcase, contaminating the oil.
* Fuel Pressure Regulator Failure: A faulty fuel pressure regulator can cause excessive fuel pressure, forcing fuel past seals and into the engine. While less likely to directly leak into the oil, it can contribute to fuel injector issues and ultimately lead to the same result.
* Damaged Intake Manifold Gasket: A crack or leak in the intake manifold gasket can allow fuel to seep into the engine's crankcase, especially if the leak is near a fuel injector or fuel rail.
* Faulty PCV (Positive Crankcase Ventilation) System: While less likely to introduce *significant* amounts of gasoline, a failing PCV valve or related components can allow some fuel vapors into the crankcase, potentially contributing to the problem. This is more likely to result in a fuel smell, rather than a massive dilution of the oil.
Why this is serious:
Gasoline in the oil drastically reduces the lubricating properties of the oil. This can lead to:
* Engine Seizure: Lack of lubrication causes extreme wear and can lead to the engine seizing up completely.
* Bearing Damage: Engine bearings rely on oil for lubrication. Gasoline contamination can destroy these bearings.
* Damage to Internal Components: Other internal engine components will be damaged due to the lack of proper lubrication and the corrosive nature of gasoline.
What to do:
* Stop driving the vehicle immediately. Continued driving will likely cause irreparable engine damage.
* Have the oil analyzed. This will confirm the presence of gasoline and its concentration.
* Have a qualified mechanic diagnose the problem. They will need to inspect the fuel injectors, fuel pressure regulator, intake manifold gasket, and the PCV system. A leak down test may also be necessary to pinpoint the source of the leak.
* Do NOT attempt to repair this yourself unless you have significant automotive experience. This is a serious issue requiring professional attention.
Ignoring this issue will almost certainly result in a costly engine rebuild or replacement. Addressing it promptly is crucial.
