2001 Mercury Mountaineer Owner Guide 1st Printing - Page 251

Capacities and specifications 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 Cubic inches Required fuel Firing order Spark plug gap Ignition system Compression ratio 4.0L SOHC V6 engine 245 87 octane 1-4-2-5-3-6 1.3-1.4 mm (0.052-0.056 inch) EDIS 9.7:1 5.0L V8 engine 283 87 octane 1-3-7-2-6-5-4-8 1.3-1.4 mm (0.052-0.056 inch) EDIS 9.4:1 251