I use Rotella 15W40 in my 06. Indmar recommends changing the oil at 50 hours. Well this boat was new to me and I changed it at 53 hours and it was very black. I read an article where Indmar now recommends changing the oil at 35 hours if you do a lot of surfing and pulling heavy loads. We surf 90% of the time so I’ll start changing at 35 hours.


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