My rule of thumb is to use a manufacturers oil. These guys know that they have to warranty their motors so they have a better quality oil. The Walmart in my town has the Quicksilver and the Evinrude xd-25 for @ $22/gal. We've always referred to Penzoil as "yellow death". The last advice that I have is that if you are still using the VRO, premix a little oil in your gas as insurance.
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1975 V-20 w/1996 225 Johnson
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