500 EFI Oil Questions
#1
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What oil and filters are you running on this engine? The engine says to run SAE 40 but I was thinking maybe a 20w50 for the hot days at havasu. Are you using the stock oil filter or a fram oil filter.
#2
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I had the 500EFIs in 2 different boats and I used the Mobil 1 15w50 synthetic oil in them without any problems. As for the filters, I used Fram oil filters and Napa gold fuel filters. I have no idea what the number was on the Napa filters, but I believe the number on the Fram filters was HP5.
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I ran the Mobil1 15w50 for over 400 hours and the motor still looked great on the inside. I use an AC Delco PF932-C oil filter. Its twice the suze of a standard filter, has very good filtering and flow characteristics according to hydrocruiser's research and holds one more quart of oil in the system than stock.