Millers Oils CRO 10W40 Motorsport Running In Oil - 5L
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Millers Oils CRO 10W40 Motorsport Running In Oil - 5L 417798

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  • Grade : 10W/40
  • Oil Type : Mineral Oil
  • Size : 5L

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Millers Oils CRO 10W40 Motorsport Running In Oil - 5L

The CRO 10w40 is a competition running in oil for test bed running of up to four hours. The oil consists of an advanced formulation of high-quality solvent refined mineral oils fortified with special low volatility components and appropriate additive treatment.


The CRO 10w40 has been designed for use in test bed running and light operational duties up to 500 mls/800 kms. It’s suitable for modified petrol and diesel engines, and has been formulated to meet the needs of professional engine builders.

The optimum temperature for the oil is 85-115°C and it has very low leak down (4%) after controlled text bed running.

  • Maximises power output by optimising the bedding in process
  • Protects highly stressed components while speeding up the bedding in process
  • Additive technology enables full load runs for short bursts
  • Viscometrics ensure that even though the additive system performance is strong, the pistons can achieve satisfactory boundary lubrication for bedding purposes

Millers Oils have a range of products and services available for different types of vehicles. It is always best to make sure the product you are putting into your vehicle is the right one.

Millers Oils technical helpdesk are available for bespoke questions including product selection, troubleshooting and general enquiries on 01484 475060 or email