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Mercruiser 454 Carb engines


On my 1994 390 I have the port engine which is original at 1180 hours, Starboard 3 years old at 125 hours. I have been using Quicksilver 25W40 oil and same filters, Quicksilver. What is the opinion of switching to the 25W40 synthetic blend? I don’t run hard if that matters, but those girls are pushing a lot of boat.

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