The Test:
We took two identical cars, both with 4.6L V8 engines, and filled one engine with Castrol EDGE Sport 0W-40 and the other with a competitor synthetic oil. Using a special test chassis dynamometer the cars were run flat out at maximum power (225bhp) without topping up the oil.
Our engine was still running strong 40hours after the competition engine had seized! Castrol EDGE Sport 0W-40 proved to deliver maximum horsepower up to 45% longer than other synthetics.
