We took two identical cars, both with 4.6L V8 engines, and filled one engine with Castrol EDGE and the other with a competitor’s synthetic oil.

Using a special test chassis dynamometer the cars were run flat out at maximum power (225bhp) up an incline of 8.8% without topping up the oil. Our engine was still running strong 40 hours after the competitor’s engine had seized. What’s more, Castrol EDGE outlasted 10 rear tyres, 1 radiator, 1 transmission, 1 catalytic converter and the car used 5 tonnes of fuel.

Castrol EDGE Sport 0W-40 and Castrol EDGE Sport 10W-60 were proven to maintain maximum horsepower for up to 45% longer than other synthetic oils.

Click 'TEST VIDEO' on the right to see the test...