A test vs. two leading brands.

After 500,000 miles, EcoPower HD 15W-40 CJ-4/SM was as good or better than two leading premium HD oils made from crude.

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A test over 1,000,000 miles.

After 1,000,000 miles with drain intervals at over 40,000 miles, EcoPower HD 15W-40 CJ-4/SM delivered exceptional engine protection.

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