Holger- sorry you interpreted it that way <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> . I should have said "(which is the VISCOSITY the owners manual recommends)" I was NOT implying that the manual says you MUST run dino oil. The manual makes no dino or synthetic reference at all. It makes NO difference if you choose to use synthetic or dino motor oil - use whatever you like, so long as it meets the API specs & viscosity ranges per the manual, or risk voiding your warranty <img border="0" title="" alt="[Eek!]" src="images/icons/shocked.gif" /> .
Joel