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Millers Oils CRO 10w-40 Competition Running In Oil - 5 Litres

£23.98 inc VAT
Oilman says...
"The only dedicated running in oil we have... and a damn good one it is too, suitable for running in competition engines on dyno etc."
Opie Oils Price Beater

About Millers Oils CRO 10w-40 Competition Running In Oil

Competition running in oil for test bed running. Advanced formulation of high quality solvent refined mineral oils fortified with special low volatility components and appropriate additive treatment.

Millers Oils CRO 10w-40 Engine Oil is also known as:
  • Millers Oil CRO 10w-40 Engine Oil
  • Millers Oil CRO 10w40 Engine Oil
  • Millers Running in oil
  • Millers Competition Running in oil

Benefits of Millers Oils CRO 10w-40 Competition Running In Oil


  • CRO 10w40 is formulated to meet the needs of the professional engine builder.
  • Maximises power output by optimising bedding in process.
  • CRO 10w40 provides full protection of highly stressed components whilst allowing optimum bedding in process for piston rings and bore.
  • CRO 10w40 additive technology enables full load runs for short bursts.
  • The viscometrics selected ensure that even though the additive system performance is strong the pistons can achieve satisfactory boundary lubrication for bedding purposes.

Tech Data for Millers Oils CRO 10w-40 Competition Running In Oil

  Technical Datasheet PDF


  • Suitable for 5 hours test bed running or 500mls/800km on road.
  • Optimum oil temperature 85-115oC.
  • Very low leak down [4%] after controlled test bed running.

Carriage Costs for Millers Oils CRO 10w-40 Competition Running In Oil

We have carriage rates to UK mainland from as little as £2.95 (Inc Vat) using our saver rate on orders less than 1kg.

Standard UK mainland carriage is now a great flat rate of £4.99 (Inc Vat) no matter what the weight (excludes some Highland post codes).

We've kept costs as low as we can. Carriage charges are based on weight - please see our table of carriage costs for full details.

How long will it take to get my order?

When placing an order with Opie Oils, we'll do all we can to get your order to you as quickly as possible. The vast majority of items are held in stock and dispatched from our UK warehouse. UK delivery will take less than 7 working days (i.e. Monday to Friday inclusive), unless we contact you to advise otherwise. In 90% of cases, delivery is made well before this, and priority ordering is also available (Click here for more details). In case of Bank Holidays please allow an extra working day.

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Millers Oils CRO 10w-40 Competition Running In Oil
                        - 5 Litres
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