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Message: <blockquote data-quote="Quackrstackr" data-source="post: 139805" data-attributes="member: 437">I have a 1968 Evinrude Fastwin that has never had the lower unit opened and has never had anything but dino-lube in it.  I'm not attempting to knock synthetics but sometimes there are answers to questions that were never asked all in the name of technology.  If it ain't broke, there's no reason to fix it, imo.That milky color that some dino-lubes turn without the presence of water may be nothing but cosmetic.My Merc. came from the factory with a l/u oil that was dark blue almost like 2 cycle oil.  You couldn't tell if that stuff was contaminated or not.</blockquote>