Ford Authority

Ford Launches New Oil Spec For 6.7L Power Stroke Diesel

Ford Motor Company is launching a new oil specification for its Power Stroke diesel engines – and especially the all-new, 6.7-liter Power Stroke V8, as found in the 2017 Ford F-Series Super Duty.

The spec is called “WSS-M2C171-F1,” which – we think you’ll agree – rolls right off the tongue and no one will have any trouble remembering, ever. Ford is presenting it as a friendlier alternative to the new CK-4 specification, as some oils meeting CK-4 standards have been found to lead to accelerated wear in the new 6.7L Power Stroke due to their low phosphorous content. Ford recommends using CJ-4 oils in a pinch, but that oil is currently being phased out.

Ford, through its Motorcraft parts brand, will shortly begin selling its own WSS-M2C171-F1 oils for Power Stroke diesels, but in the meantime, there’s another option: some CK-4 oils have been tested and approved to meet WSS-M2C171-F1 standards. They are available in SAE 10W-40, 15W-40, 5W-40, and 0W-40 grades; SAE 10W-30 oils made to CK-4 spec cannot be compliant with WSS-M2C171-F1.

For more, watch the video above.

Aaron Brzozowski is a writer and motoring enthusiast from Detroit with an affinity for '80s German steel. He is not active on the Twitter these days, but you may send him a courier pigeon.

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