If you are still under warranty... use what the factory requires... XD 100 oil only... The warranty on my E-Tec is good for almost another four years and I wouldn't consider doing anything that might void it... I've needed some warranty work on my motor since they quit making them - and so far they really are honoring those warranties... This from a guide in hard commercial service... on his fourth E-Tec (and would have bought a fifth one if they still made them when the time came...).
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Bob LeMay
(954) 435-5666