Buick Regal, GM10 (USA / CAN)

Automatic transmission fluid capacity & service interval

Buick Regal, GM10 (USA / CAN) automatic transmission fluid capacity ranges from 7 to 9,5 liters. Service intervals include checking every 12 months and changing fluid every 83000 km or 166000 km. The data covers 8 configurations.

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

TypeSpecifications
Regal 3.8 V6 (2003-2004)
  • Use: Normal
  • Capacity 9,5 liter (Overhaul capacity)
  • Capacity 7 liter (Service fill)
  • Check 12 months
  • Change 166000 km
  • Code: 4/1
Regal 3.8 V6 (2003-2004)
  • Use: Severe
  • Capacity 9,5 liter (Overhaul capacity)
  • Capacity 7 liter (Service fill)
  • Check 12 months
  • Change 83000 km
  • Code: 4/1
Regal 3.8 V6 Supercharged (2003-2004)
  • Use: Normal
  • Capacity 9,5 liter (Overhaul capacity)
  • Capacity 7 liter (Service fill)
  • Check 12 months
  • Change 166000 km
  • Code: 4/1
Regal 3.8 V6 Supercharged (2003-2004)
  • Use: Severe
  • Capacity 9,5 liter (Overhaul capacity)
  • Capacity 7 liter (Service fill)
  • Check 12 months
  • Change 83000 km
  • Code: 4/1
Regal 3.8 V6 (1997-2003)
  • Use: Normal
  • Capacity 9,5 liter (Overhaul capacity)
  • Capacity 7 liter (Service fill)
  • Check 12 months
  • Change 166000 km
  • Code: 4/1
Regal 3.8 V6 (1997-2003)
  • Use: Severe
  • Capacity 9,5 liter (Overhaul capacity)
  • Capacity 7 liter (Service fill)
  • Check 12 months
  • Change 83000 km
  • Code: 4/1
Regal 3.8 V6 Supercharged (1997-2003)
  • Use: Normal
  • Capacity 9,5 liter (Overhaul capacity)
  • Capacity 7 liter (Service fill)
  • Check 12 months
  • Change 166000 km
  • Code: 4/1
Regal 3.8 V6 Supercharged (1997-2003)
  • Use: Severe
  • Capacity 9,5 liter (Overhaul capacity)
  • Capacity 7 liter (Service fill)
  • Check 12 months
  • Change 83000 km
  • Code: 4/1

Additional Notes

  • Across all configurations of the Buick Regal GM10 covered here, the automatic transaxle carries a service fill capacity of 7 liters, which represents the amount of fluid needed when draining and refilling during a routine service without removing the unit from the vehicle.
  • The overhaul capacity of 9.5 liters applies to every configuration listed, reflecting the total fluid volume required when the transaxle is fully disassembled, cleaned, and rebuilt, accounting for fluid retained in passages and components that a simple drain does not evacuate.
  • The 2.5-liter difference between the 7-liter service fill and the 9.5-liter overhaul capacity indicates that approximately 2.5 liters of fluid remains trapped within the transaxle during a standard drain procedure.
  • Under normal use conditions, the 3.8 V6 in the 1997-2003 range carries a fluid change interval of 166,000 km, while severe use conditions reduce that interval to 83,000 km, exactly half the normal figure.
  • The same 166,000 km normal and 83,000 km severe change intervals apply to the 3.8 V6 Supercharged variant across both the 1997-2003 and 2003-2004 ranges, meaning the forced-induction engine shares identical transmission service intervals with the naturally aspirated version.
  • A fluid level check interval of 12 months is specified for all configurations regardless of use condition, meaning both normal and severe duty applications share the same annual inspection schedule.
  • The 3.8 V6 and 3.8 V6 Supercharged variants each appear under two overlapping year ranges, 1997-2003 and 2003-2004, with identical capacity and interval figures across both ranges for their respective use conditions.

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