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#25292
Casey Lynn
Participant

    US Member

    I have used pretty much everything from bean oils to Klotz (for racing).
    There was a thread on here not too long ago that covered exactly what you are asking and your thinking is spot on. The general consensus is that the square tank engines run better with a thicker oil in them.
    As an example, in my square tank engines I run a blend of TCW3 Johnson/Evinrude XD-30 oil and aircraft ashless dispersant oil.