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Message: <blockquote data-quote="smurfslayer" data-source="post: 1420992" data-attributes="member: 21926">if you’re concerned about the warranty, one thing you should be looking at is does the oil have an API certification.  some of the amsoil do not, and while they may be awesome, if you have a hard part failure and a bunch of maintenance receipts showing use of a non approved part, in this case oil, they can absolutely deny warranty coverage for it.  The F150 manual makes a thing of the certification, ~page 325"Only use oils certified for gasoline engines by the American Petroleum Institute (API). An oil with this trademark symbol conforms to the current engine and emission system protection standards and fuel economy requirements of the International Lubricants Specification Advisory Committee (ILSAC)."...p394"use motor oils of the recommended viscosity grade that meet API SN requirements and display the API Certification Mark for gasoline engines. Do not use oil labeled with API SN service category unless the label also displays the API certification mark."<ol> <li data-xf-list-type="ol"></li> </ol></blockquote>

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