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

Coolant capacity & service interval

Mercedes-Benz SLC-Class, R172 (USA / CAN) requires coolant with a capacity range of 1,9 to 10,4 liters. The service interval is 155000 miles or 180 months. The data covers 4 configurations.

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

TypeSpecifications
SLC 300, 172.438 (2016-2020)
  • Use: Normal
  • Capacity 9,5 liter
  • Change 155000 miles/ 180 months
  • SLC 300, 172.438 (2016-2020)
  • Intercooler
  • Use: Normal
  • Capacity 1,9 liter
  • Change 155000 miles/ 180 months
SLC 43 AMG, 172.466 (2016-2020)
  • Use: Normal
  • Capacity 10,4 liter
  • Change 155000 miles/ 180 months
  • SLC 43 AMG, 172.466 (2016-2020)
  • Intercooler
  • Use: Normal
  • Capacity 3,4 liter
  • Change 155000 miles/ 180 months

Additional Notes

  • The Mercedes-Benz SLC-Class R172 cooling system interval is 155,000 miles or 180 months under normal use conditions, applying uniformly across all variants in the 2016-2020 range. The 180-month figure equals 15 years, placing this among the longer factory-specified coolant service intervals in the passenger car segment.
  • The SLC 300 (172.438) main cooling system holds 9.5 liters, a capacity consistent with a turbocharged four-cylinder engine layout where the coolant circuit covers the engine block, cylinder head, heater core, and associated plumbing.
  • A separate intercooler circuit on the SLC 300 carries 1.9 liters of coolant. Intercooler circuits are thermally isolated from the main engine loop to manage charge-air temperatures independently, which is why the capacity is tracked and serviced as a distinct system.
  • The SLC 43 AMG (172.466) main cooling system capacity is 10.4 liters, which is 0.9 liters greater than the SLC 300 figure. The larger volume reflects the AMG's twin-turbocharged 3.0-liter V6 engine, which generates more heat and requires a more extensive coolant circuit.
  • The SLC 43 AMG intercooler circuit holds 3.4 liters, nearly double the 1.9-liter intercooler capacity of the SLC 300. A twin-turbocharged V6 produces substantially more compressed intake air than a single-turbocharged four-cylinder, requiring a larger charge-air cooling circuit to handle the increased thermal load.
  • Both the main cooling system and the intercooler circuit on each variant share the same service interval of 155,000 miles or 180 months under normal use, meaning both circuits are due for coolant replacement at the same point in the service schedule.

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