Mercedes-Benz SLK-Class, R172 (USA / CAN)

Coolant capacity & service interval

Mercedes-Benz SLK-Class, R172 (USA / CAN) requires coolant with a capacity range of 9,6 to 10,4 liters. Service intervals occur at 155000 miles or 180 months. The data covers 3 configurations.

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

TypeSpecifications
SLK 55 AMG, 172.475 (2012-2015)
  • Use: Normal
  • Between min and max.
  • Change 155000 miles/ 180 months
SLK 250, 172.447 (2011-2015)
  • Use: Normal
  • Capacity 9,6 liter
  • Change 155000 miles/ 180 months
SLK 350, 172.457 (2011-2015)
  • Use: Normal
  • Capacity 10,4 liter
  • Change 155000 miles/ 180 months

Additional Notes

  • The SLK 250 (172.447) carries a cooling system capacity of 9.6 liters, while the SLK 350 (172.457) holds 10.4 liters, a difference of 0.8 liters that reflects the larger displacement and associated thermal load of the V6 engine compared to the four-cylinder unit.
  • Across the SLK 250 and SLK 350, the 9.6- and 10.4-liter figures represent total cooling system fill volumes, meaning the full amount of coolant the system holds when serviced from a drained state.
  • The SLK 55 AMG (172.475) does not carry a fixed liter value for its cooling system. Instead, the specification references filling between the minimum and maximum marks, indicating a top-up or level-based service approach rather than a measured full-drain refill quantity.
  • All three configurations share an identical service interval of 155,000 miles or 180 months under normal use conditions, placing the coolant change on a long-life schedule rather than a conventional short-cycle replacement program.
  • The 180-month figure equals 15 years, meaning the time-based interval is the more likely limiting factor for many vehicles before the mileage threshold is reached under typical driving patterns.
  • The SLK 55 AMG production years in the specifications begin in 2012, one year later than the SLK 250 and SLK 350, both of which are listed from 2011-2015.
  • The normal use condition applied to all three rows means the 155,000-mile and 180-month intervals are not adjusted for more demanding operating environments, as no separate severe-use interval appears in the specifications for any of the three configurations.

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