In my towboat I run optimax oil exclusively. But I don't have to pay for it. I double checked the price of Yamalube at my marina. List price is $34. But even with my discount it can't beat the Penzoil. Plus with the Yamalube I have to use ring free or I will foul plugs over time. I was told by others that had the same problem that also switched to Penzoil and they never fouled a plug again. I figure with my old motor it's worth a shot.
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