Mercury Grand Marquis

Differential fluid capacity & service interval

Mercury Grand Marquis differential fluid capacity ranges from 1,8 to 2,4 liters. Service intervals include changes at 50000 and 100000 miles, and checks at 12000 km or 12 months. The data covers 12 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
  • Grand Marquis 4.6 V8 (2005-2011)
  • Rear
  • Use: Normal
  • Capacity 2,4 liter
  • Grand Marquis 4.6 V8 (2005-2011)
  • Rear, limited slip
  • Use: Normal
  • Capacity 2,4 liter
  • Change 100000 miles
  • Code: Trac-Lok
  • Grand Marquis 4.6 V8 (2005-2011)
  • Rear, limited slip
  • Use: Severe
  • Capacity 2,4 liter
  • Change 50000 miles
  • Code: Trac-Lok
  • Grand Marquis 4.6 V8 (2003-2005)
  • Rear
  • Use: Normal
  • Capacity 2,4 liter
  • Grand Marquis 4.6 V8 (2003-2005)
  • Rear, limited slip
  • Use: Normal
  • Capacity 2,4 liter
  • Change 100000 miles
  • Code: Trac-Lok
  • Grand Marquis 4.6 V8 (2003-2005)
  • Rear, limited slip
  • Use: Severe
  • Capacity 2,4 liter
  • Change 50000 miles
  • Code: Trac-Lok
  • Grand Marquis 4.6 V8 (1998-2002)
  • Rear
  • Use: Normal
  • Capacity 1,8 liter
  • Grand Marquis 4.6 V8 (1990-1997)
  • Rear
  • Use: Normal
  • Capacity 1,8 liter
  • Change 100000 miles
  • Grand Marquis 4.6 V8 (1990-1997)
  • Rear
  • Use: Severe
  • Capacity 1,8 liter
  • Change 50000 miles
  • Grand Marquis 4.6 V8 (1990-1997)
  • Rear, limited slip
  • Use: Normal
  • Capacity 1,8 liter
  • Change 100000 miles
  • Code: Trac-Lok
  • Grand Marquis 4.6 V8 (1990-1997)
  • Rear, limited slip
  • Use: Severe
  • Capacity 1,8 liter
  • Change 50000 miles
  • Code: Trac-Lok
  • Grand Marquis 4.9 V8 (1986-1990)
  • Rear
  • Use: Normal
  • Capacity 1,8 liter
  • Check 12000 km/ 12 months

Additional Notes

  • The Mercury Grand Marquis 4.9 V8 from 1986-1990 carries a rear differential fluid capacity of 1.8 liters, with a service interval expressed as an inspection at 12,000 km or 12 months rather than a mileage-based fluid change, which distinguishes it from all other configurations in the specifications.
  • The 4.6 V8 from 1990-1997 also holds 1.8 liters in the rear differential, matching the earlier 4.9 V8 capacity figure, and carries a normal-use change interval of 100,000 miles for both the standard and limited slip rear differential variants.
  • Under severe use conditions, the 1990-1997 4.6 V8 rear differential interval drops to 50,000 miles, which is half the normal-use interval, applying equally to both the standard and limited slip configurations at the same 1.8-liter capacity.
  • The 1998-2002 4.6 V8 rear differential retains the 1.8-liter capacity but carries no change interval in the specifications, unlike the surrounding model year ranges where interval data is present.
  • Starting with the 2003-2005 4.6 V8, the rear differential fluid capacity increases to 2.4 liters, a rise of 0.6 liters compared to the 1990-2002 configurations, indicating a physically larger differential housing.
  • The 2003-2005 standard rear differential lists a 2.4-liter capacity under normal use but carries no change interval, while the limited slip variant for the same years includes both a 100,000-mile normal-use interval and a 50,000-mile severe-use interval at the same capacity.
  • The 2005-2011 4.6 V8 rear differential specifications mirror the 2003-2005 pattern exactly: 2.4 liters across all variants, no change interval for the standard differential, and 100,000-mile normal versus 50,000-mile severe intervals for the limited slip configuration.
  • Across all configurations where both normal and severe change intervals appear, the severe-use interval is consistently set at exactly half the normal-use interval, reflecting the increased stress that severe operating conditions place on differential fluid degradation.

Other Systems