Normal Vehicle Axle Maintenance

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

Rear axles and transfer case/Power Transfer Unit (PTU) containing synthetic lubricant and light duty trucks equipped with Ford design axles are lubricated for life. These lubricants are not to be checked or changed unless service is required, or if a leak is suspected or the axle assembly has been submerged in water.

The axle and transfer case/PTU fluid should be changed anytime they have been submerged in water. Non-synthetic rear axle lubricants should be installed new every 4,800 km (3,000 mi) or 3 months, whichever occurs first, during extended trailer tow operation above 21°C (70°F) ambient and Wide Open Throttle (WOT) for extended periods above 72 km/h (45 mph).

The 4,800 km (3,000 mi) lube change interval may be waived if the axle was filled with 75W-140 synthetic gear lubricant. Add 118 ml (4 oz) of additive friction modifier for complete refill of Traction-Lok® rear axles.

The axle lubricant should be changed anytime an axle has been submerged in water.