Millers CRO 10w40 Running In Engine Oil

£9.15£24.99 (+VAT)

Millers CRO 10w40 is a competition running in oil for test bed running up to 4 hours. Advanced formulation of high quality solvent refined mineral oils fortified with special low volatility components and appropriate additive treatment. Carefully formulated to offer an extremely high protection level to new engine components and speed up the bedding in process.
Ideally suited for test bed running.

For full details on performance profiles and specifications please refer to the technical data sheet which can be found in the toggles below.


Mineral, CRO 10w40 multi viscosity running in oil.


Used to run in rebuilt engines to ensure correct “bedding” in of highly stressed engine components such as the crankshaft and valve train etc.

The running in procedure can be carried out on a test bed or in vehicle on the road. May be used for light operational duties up to 500mls/800kms if running in on the road.

Typical Characteristics

  • Density @ 15° C. g/ml: 0.870
  • Kinematic Viscosity @ 100°C, cSt: 14.1
  • Flashpoint °C: >220

Features & Benefits

  • By using the Competition Running In Oil the engine will produce peak power and torque when required
  • Increased component longevity through Blower wear
  • Lower oil consumption
  • Maintains oil pressure
  • Avoids bore glazing and high blow-by

Technical Data Sheet


CRO 10w40 Technical Sheet

Safety Data Sheet


CRO 10w40 Safety Sheet

Estimated dispatch time within 3 working days.

Picture for illustration purposes only. Actual parts may differ slightly in appearance.