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What grade oil do you use in 95 cougar XR7 v8?

The recommended oil grade for a 1995 Mercury Cougar XR7 V8 depends on your location and the operating temperature. The owner's manual is the definitive source. However, a common recommendation for that era and engine type (likely a 4.6L V8) would be 5W-20 or 10W-30.

Crucially: Check your owner's manual. The recommended oil grade will be specified there, taking into account the climate where you live. Using the wrong grade can damage your engine.