Aprilia RX

Coolant capacity & service interval

Aprilia RX coolant capacity ranges from 0,8 to 1 liter. Service intervals include checks at 1000, 4000, and 6000 km, and changes at 12 and 24 months. The data covers 6 configurations.

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

TypeSpecifications
RX 125 Euro 5 (2021- )
  • Use: Normal
  • Capacity 0,8 liter
  • Check 6000 km
  • Change 24 months
RX 125 Euro 4 (2017-2021)
  • Use: Normal
  • Capacity 0,8 liter
  • Check 6000 km
  • Change 24 months
RX 125 (2008-2017)
  • Use: Normal
  • Capacity 0,8 liter
  • Check 4000 km
  • Change 24 months
RX 50 (2004-2005)
  • Use: Normal
  • Capacity 0,9 liter
  • Check 12 months
  • Change 24 months
RX 125 (1997-2007)
  • Use: Normal
  • Capacity 1 liter
  • Check 4000 km
  • Change 24 months
RX 125 (1997-2007)
  • Use: Initial service
  • Capacity 1 liter
  • Check 1000 km

Additional Notes

  • The Aprilia RX 125 produced from 1997-2007 holds 1 liter of coolant, which is the largest cooling system capacity across all RX variants listed. Later generations of the same model were revised down to 0.8 liters, reflecting changes in engine packaging or cooling circuit design between production runs.
  • The 1997-2007 RX 125 includes a dedicated initial service interval requiring a coolant check at 1000 km. A separate normal-use schedule then takes over, with checks every 4000 km and a full fluid change every 24 months.
  • From the 2008-2017 generation onward, the RX 125 cooling system capacity dropped to 0.8 liters. The check interval remained at 4000 km and the change interval stayed at 24 months, keeping the service schedule consistent with the earlier generation despite the reduced capacity.
  • The RX 125 Euro 4 (2017-2021) and Euro 5 (2021- ) variants both share a 0.8-liter capacity and a 24-month change interval, but the check interval increased to 6000 km compared to the 4000 km interval used on pre-Euro 4 versions. Euro 4 and Euro 5 refer to European emissions standards that govern exhaust output and engine management calibration.
  • The RX 50 (2004-2005) holds 0.9 liters of coolant, placing its capacity between the 1-liter early RX 125 and the 0.8-liter later variants. As a 50 cc displacement model, the cooling circuit volume reflects the smaller but still liquid-cooled engine architecture used in that class.
  • The RX 50 uses a time-based check interval of every 12 months rather than a distance-based one, unlike all RX 125 variants which specify kilometer-based check intervals. The change interval for the RX 50 remains 24 months, consistent with the rest of the RX range.

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