Oldsmobile Alero (USA / CAN)

Automatic transmission fluid capacity & service interval

Oldsmobile Alero (USA / CAN) automatic transmission fluid capacity ranges from 6,5 to 9 liters. Service intervals include checking every 22 months and changing every 50000 miles. The data covers 3 configurations.

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

TypeSpecifications
Alero 2.2 16V (2002-2004)
  • Use: Severe, flexible (max)
  • Capacity 9 liter (Total)
  • Check 22 months
  • Change 50000 miles
  • Code: 4T40-E 4/1
Alero 2.4 16V (1999-2001)
  • Use: Severe
  • Capacity 6,5 liter
  • Capacity 9 liter (Total)
  • Change 50000 miles
  • Code: 4T40-E 4/1
Alero 3.4 V6 (1999-2004)
  • Use: Severe, flexible (max)
  • Capacity 6,5 liter
  • Check 22 months
  • Change 50000 miles
  • Code: 4T40-E 4/1

Additional Notes

  • The Oldsmobile Alero 2.4 16V (1999-2001) automatic transaxle carries a service fill capacity of 6.5 liters, with a total system capacity of 9 liters. The difference between those two figures reflects fluid retained in the torque converter and cooler lines during a standard drain-and-fill, meaning a full overhaul or dry-fill procedure requires the larger 9-liter figure.
  • The Alero 2.2 16V (2002-2004) lists only the 9-liter total capacity for its automatic transaxle, without a separate service fill figure. When only a total capacity is listed, that value represents the complete dry-fill volume of the transaxle assembly.
  • Across all three engine configurations, the severe-use automatic transaxle fluid change interval is set at 50,000 miles. Severe use typically covers conditions such as frequent towing, trailer hauling, extended idling, or operation in extreme temperatures.
  • The 2.4 16V (1999-2001) specifies a 50,000-mile change interval under severe use but carries no check interval in the row specifications, while the 2.2 16V and 3.4 V6 both include a 22-month check interval alongside the same change mileage.
  • The 2.2 16V and 3.4 V6 configurations share a flexible (max) designation alongside the severe use condition. In flexible or oil life monitor systems, the listed interval represents the maximum allowable interval regardless of what the vehicle's monitoring system may indicate.
  • The 3.4 V6 (1999-2004) automatic transaxle service fill capacity is 6.5 liters under severe and flexible (max) use conditions, without a separate total capacity figure listed in the row specifications.
  • The 2.4 16V engine was available in the Alero from 1999-2001, while the 2.2 16V replaced it from 2002-2004. Both engines use an automatic transaxle with a 6.5-liter service fill, though the 2.4 16V also carries the 9-liter total capacity figure in its specifications.

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