Mercury Mountaineer 2001 - Manual (Page 251)

4.0L vehicles with limited slip differentials and all 5.0L applications use
rear axles that are filled with Motorcraft SAE 75W-140 High Performance
Synthetic Rear Axle Lubricant, part number F1TZ-19780-B, Ford
specification WSL-M2C192-A.
4.0L vehicles with limited slip differentials and all 5.0L applications must
add 118 ml (4 oz) of Additive Friction Modifier C8AZ-19B546-A or
equivalent meeting Ford specification EST-M2C118-A to the rear axle
whenever the axle has been serviced.
ENGINE DATA
Engine 4.0L SOHC V6 engine 5.0L V8 engine
Cubic inches 245 283
Required fuel 87 octane 87 octane
Firing order 1-4-2-5-3-6 1-3-7-2-6-5-4-8
Spark plug gap 1.3-1.4 mm
(0.052-0.056 inch) 1.3-1.4 mm
(0.052-0.056 inch)
Ignition system EDIS EDIS
Compression ratio 9.7:1 9.4:1
Capacities and specifications
251