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Message: <blockquote data-quote="John Rathjen" data-source="post: 1421423" data-attributes="member: 37884">Well this is straight from the horse's mouth:Hello John,Thank you for contacting AMSOIL with your question.Ford calls for an engine oil specification of WSS-M2C946-, they also attach the spec to the oil weight. So our 0w-40 will not meet this specification that Ford calls for so a lot of times they can use that as a reason to deny warranty coverage. I would recommend using our 0w-30 if you want to improve the cold starting capabilities, but then it will still meet the specification Ford lists because it is a 30 weight.Let us know if you need any other information.Thank you,AMSOIL Technical ServicesTech Line: 715-399-8324Email: <a href="mailto:tech@amsoil.com">tech@amsoil.com</a></blockquote>

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