Mercedes-Benz SL-Class, R129 (USA / CAN)

Coolant capacity & service interval

Mercedes-Benz SL-Class, R129 (USA / CAN) coolant capacity ranges from 11,5 to 19 liters. The service interval for coolant is 36 months. The data covers 3 configurations.

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

TypeSpecifications
SL 320 (1993-1998)
  • Use: Normal
  • Capacity 11,5 liter
  • Change 36 months
SL 500 (1993-2001)
  • Use: Normal
  • Capacity 15 liter
  • Change 36 months
SL 600 (1993-2001)
  • Use: Normal
  • Capacity 19 liter

Additional Notes

  • The SL 320 cooling system holds 11.5 liters, the smallest capacity among the three R129 variants listed, reflecting the comparatively smaller displacement of the inline-six engine.
  • The SL 500 cooling system capacity is rated at 15 liters, a figure consistent with the greater thermal load produced by a V8 engine relative to the six-cylinder SL 320.
  • The Mercedes-Benz SL 600 carries the largest cooling system capacity at 19 liters, which corresponds to the demands of a V12 engine and represents a 4-liter increase over the SL 500 figure.
  • Both the SL 320 and SL 500 specify a 36-month coolant change interval under normal use conditions, meaning routine driving without the added stress of towing, extreme temperatures, or other demanding operating environments.
  • The SL 320 cooling system specification applies to the 1993-1998 model years, while the SL 500 and SL 600 share the broader 1993-2001 span, indicating the SL 320 had a shorter production window within the R129 generation covered by these specifications.
  • No change interval is listed for the SL 600 cooling system, whereas the SL 320 and SL 500 both carry the 36-month figure, making the SL 600 entry a capacity-only specification within the data provided.

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