BMW 1 series Convertible, E88 (USA)

Automatic transmission fluid capacity & service interval

BMW 1 series Convertible, E88 (USA) requires automatic transmission fluid with a capacity range of 9-10 liters. The service interval for fluid replacement is 100000 miles. The data covers 5 configurations.

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

TypeSpecifications
128i Convertible, N52 (2011-2013)
  • Use: Normal
  • Capacity 9-10 liter
  • Change 100000 miles
  • Code: GM GA6L45R (GM6) 6/1
128i Convertible, N51 (2011-2013)
  • Use: Normal
  • Capacity 9-10 liter
  • Change 100000 miles
  • Code: GM GA6L45R (GM6) 6/1
128i Convertible, N52 (2007-2011)
  • Use: Normal
  • Capacity 9-10 liter
  • Change 100000 miles
  • Code: GM GA6L45R (GM6) 6/1
128i Convertible, N51 (2007-2011)
  • Use: Normal
  • Capacity 9-10 liter
  • Change 100000 miles
  • Code: GM GA6L45R (GM6) 6/1
135i Convertible, N54 (2007-2010)
  • Use: Normal
  • Capacity 9 liter
  • Change 100000 miles
  • Code: ZF 6HP19 6/1

Additional Notes

  • The BMW 1 Series Convertible E88 (USA) automatic transmission fluid capacity spans 9 to 10 liters across the 128i configurations with N51 and N52 engines, reflecting a service fill range rather than a fixed single volume, which accounts for variation in residual fluid retained within the transmission after a drain.
  • The 135i Convertible with the N54 engine carries a narrower capacity of exactly 9 liters, sitting at the lower bound of the range specified for the 128i variants.
  • All four 128i configurations — covering both the N51 and N52 engine variants across the 2007-2011 and 2011-2013 model year splits — share an identical 9-10 liter capacity and a 100,000-mile change interval under normal use conditions.
  • The 100,000-mile change interval listed for the 135i Convertible N54 under normal use conditions aligns with the same interval applied across all 128i configurations, placing every E88 automatic transmission entry at the same service frequency under normal operating conditions.
  • The N51 and N52 engine variants of the 128i Convertible are represented across overlapping model year groupings of 2007-2011 and 2011-2013, yet the fluid capacity and change interval remain unchanged between those two periods for each respective engine.
  • A 9-10 liter automatic transmission fluid capacity is characteristic of a multi-speed automatic gearbox with a torque converter, where total system volume includes the converter, valve body, and cooler circuit in addition to the main sump.

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