Engine Related:
* Valve Cover Gasket(s): A very common source of leaks, especially as the vehicle ages. Oil leaks from the top of the engine.
* Oil Pan Gasket: Located at the bottom of the engine, a leak here will result in oil dripping onto the ground. This is often caused by age, damage, or improper tightening during previous service.
* Rear Main Seal: This seal is located at the back of the engine where the crankshaft exits. Leaks are usually noticeable as oil dripping down the back of the engine, and can be difficult to access.
* Crankshaft Seal(s): Similar to the rear main seal, these seals can wear out and leak.
* Oil Pressure Sending Unit/Sensor: A relatively small leak, but can still be noticeable.
* Timing Cover Gasket: Less common, but a leak here would indicate a potential more serious issue.
Other Potential Sources:
* Oil Filter: A poorly installed or damaged oil filter can leak.
* PCV Valve: While not directly an oil leak, a faulty PCV valve can cause excessive oil pressure and lead to leaks from other components.
Important Considerations:
* Location of the leak: The location of the oil stain on the ground, or the area where the oil is visible on the engine, will help significantly in diagnosing the problem.
* Amount of the leak: A slow drip is different from a steady stream. This gives an indication of the severity of the problem.
* Color of the oil: While usually dark, the color can sometimes indicate other potential issues. Milky oil might suggest a head gasket problem.
Recommendation:
It's highly recommended to have a qualified mechanic inspect your Windstar to accurately diagnose and repair the oil leak. Ignoring an oil leak can lead to serious engine damage. Attempting DIY repair without the proper knowledge and tools can also cause further damage.
