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What oil filter should you use in a 72 mercury cougar 351 engine?

The correct oil filter for a 1972 Mercury Cougar with a 351 engine depends on the specific filter used at the factory and what's readily available today. There isn't one single definitive answer.

To find the right filter, you should:

1. Check your owner's manual: If you still have the original owner's manual, it will specify the correct oil filter part number.

2. Look at the old filter: If you've recently changed the oil, check the old filter for the part number printed on it.

3. Consult a parts store: Take your vehicle information (year, make, model, and engine size) to a reputable auto parts store (like AutoZone, Advance Auto Parts, NAPA). They can look up the correct filter for your car using their computer systems.

4. Cross-reference filter numbers: Once you get a part number (either from the manual, old filter, or parts store), you can cross-reference it online or at the parts store to find equivalent filters from different brands.

Important Note: Don't just rely on general "351 Ford" information. Even within the 351 engine family (Windsor, Cleveland, etc.), filter requirements can vary slightly. Using the wrong filter can lead to improper oil filtration and potential engine damage. Be sure to use a filter that's the correct size and flow rate for your specific 351 engine.