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I run Valvoline Dura blend 15-50 in my Jet Boat, which has a Subaru EA71 (1600cc) powerplant. It has an oil temp guage (VDO) and it sits between 90-105 deg C. Do you consider this ok? What change interval (hours) do you feel would be best for this application. The local Valvoline rep says 100hrs but that is a long time.
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