Hyundai IONIQ, AE (USA)

Differential fluid capacity & service interval

Hyundai IONIQ, AE (USA) differential fluid capacity ranges from 1 to 1,4 liters. Service intervals include checking at 35000 miles or 28 months and changing at 75000 miles. The data covers 4 configurations.

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

TypeSpecifications
  • IONIQ Electric (2019-2022)
  • Reduction gear unit
  • Use: Normal
  • Capacity 1,2-1,4 liter
  • Check 35000 miles/ 28 months
  • IONIQ Electric (2019-2022)
  • Reduction gear unit
  • Use: Severe
  • Capacity 1,2-1,4 liter
  • Check 35000 miles/ 28 months
  • Change 75000 miles
  • IONIQ Electric (2017-2019)
  • Reduction gear unit
  • Use: Normal
  • Capacity 1-1,1 liter
  • Check 35000 miles/ 28 months
  • IONIQ Electric (2017-2019)
  • Reduction gear unit
  • Use: Severe
  • Capacity 1-1,1 liter
  • Check 35000 miles/ 28 months
  • Change 75000 miles

Additional Notes

  • The Hyundai IONIQ Electric (AE, USA) uses a combined differential and reduction gear unit as a single fluid-sharing assembly, meaning the listed capacity covers both functions together rather than separate sumps.
  • The 2017-2019 IONIQ Electric differential and reduction gear unit holds 1.0-1.1 liters of fluid, while the 2019-2022 variant carries a noticeably larger 1.2-1.4 liter capacity, reflecting a hardware change between those production periods.
  • The capacity range format, such as 1.2-1.4 liters, is typical of a service fill specification, accounting for minor variation during a drain-and-refill procedure rather than representing a full overhaul or dry-fill quantity.
  • Under normal use conditions, both the 2017-2019 and 2019-2022 IONIQ Electric specifications call for a fluid check at 35,000 miles or 28 months, with no fluid change interval listed for normal use.
  • Under severe use conditions, the check interval remains the same 35,000 miles or 28 months, but an additional fluid change at 75,000 miles is specified for both the 2017-2019 and 2019-2022 IONIQ Electric configurations.
  • The 28-month time-based check interval running alongside the 35,000-mile mileage interval means whichever threshold is reached first would apply, which is standard practice for dual-condition service schedules.
  • The severe use change interval of 75,000 miles is exactly double the 35,000-mile check interval, suggesting the check at the midpoint serves as a condition assessment before the mandatory change at the full interval.

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