BMW Z4 Roadster, G29 (EU)

Coolant capacity & service interval

The BMW Z4 Roadster, G29 (EU) coolant specifications include capacities of 8.4 liters, 3.6 liters, and 8.6 liters for different circuits. The data covers 9 configurations.

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

TypeSpecifications
Z4 Roadster sDrive20i (120 kW) (2019- )
  • Use: Normal
  • Capacity 8,4 liter (High temperature circuit)
  • Capacity 3,6 liter (Low temperature circuit)
Z4 Roadster sDrive20i (145 kW) (2019- )
  • Use: Normal
  • Capacity 8,4 liter (High temperature circuit)
  • Capacity 3,6 liter (Low temperature circuit)
Z4 Roadster sDrive30i (2019- )
  • Use: Normal
  • Capacity 8,6 liter (High temperature circuit)
  • Capacity 3,6 liter (Low temperature circuit)
  • Z4 Roadster sDrive20i (120 kW) (2018-2019)
  • As of prod. date 01-12-2018
  • Use: Normal
  • Capacity 8,4 liter (High temperature circuit)
  • Capacity 3,6 liter (Low temperature circuit)
  • Z4 Roadster sDrive20i (120 kW) (2018-2019)
  • Up to prod. date 30-11-2018
  • Use: Normal
  • Capacity 8,4 liter (High temperature circuit)
  • Capacity 3,6 liter (Low temperature circuit)
  • Z4 Roadster sDrive20i (145 kW) (2018-2019)
  • As of prod. date 01-12-2018
  • Use: Normal
  • Capacity 8,4 liter (High temperature circuit)
  • Capacity 3,6 liter (Low temperature circuit)
  • Z4 Roadster sDrive20i (145 kW) (2018-2019)
  • Up to prod. date 30-11-2018
  • Use: Normal
  • Capacity 8,4 liter (High temperature circuit)
  • Capacity 3,6 liter (Low temperature circuit)
  • Z4 Roadster sDrive30i (2018-2019)
  • As of prod. date 01-12-2018
  • Use: Normal
  • Capacity 8,4 liter (High temperature circuit)
  • Capacity 3,6 liter (Low temperature circuit)
  • Z4 Roadster sDrive30i (2018-2019)
  • Up to prod. date 30-11-2018
  • Use: Normal
  • Capacity 8,4 liter (High temperature circuit)
  • Capacity 3,6 liter (Low temperature circuit)

Additional Notes

  • The BMW Z4 Roadster G29 cooling system is split into two separate circuits: a high temperature circuit and a low temperature circuit. The high temperature circuit handles the main engine cooling load, while the low temperature circuit typically serves auxiliary systems such as charge air cooling or power electronics.
  • Across the sDrive20i variants in both 120 kW and 145 kW outputs, the coolant capacity is identical at 8.4 liters for the high temperature circuit and 3.6 liters for the low temperature circuit, regardless of production date or model year grouping.
  • The sDrive30i produced from 2019 onward carries a high temperature circuit capacity of 8.6 liters, compared to 8.4 liters in the 2018-2019 production period. The low temperature circuit remains at 3.6 liters across all sDrive30i entries.
  • The 0.2-liter difference in the sDrive30i high temperature circuit between the pre- and post-2019 specifications reflects a minor but deliberate change in system volume, which can affect the total amount of coolant required during a full drain and refill service.
  • A production date boundary of 30 November 2018 and 1 December 2018 divides the 2018-2019 entries for the sDrive20i (both power outputs) and the sDrive30i into two distinct specification rows. Despite this split, the capacities listed for the sDrive20i variants are the same on both sides of that boundary.
  • The use condition listed for all entries is normal, meaning the capacities specified apply to standard operating conditions rather than a separate severe-use or first-fill scenario.