Check your owner's manual for the exact recommendation. However, generally:
* 5W-30 is a common and often recommended oil weight for both engines in most climates.
* 10W-30 might be suitable for warmer climates.
Crucially: The owner's manual will specify the API (American Petroleum Institute) service classification (e.g., SM, SN, SP, etc.). Always use an oil that meets or exceeds the specified API classification. It will also specify whether it should be synthetic blend, synthetic, or conventional.
Finding the information:
1. Owner's Manual: This is the most reliable source.
2. Oil Fill Cap: The oil fill cap often has a recommendation printed on it.
3. Sticker Under the Hood: Some vehicles have a sticker under the hood detailing recommended fluids.
Don't rely solely on online information; use the sources above to ensure you use the correct oil for your specific 2001 Ford Windstar. Using the wrong oil can damage your engine.
