"NOYB" wrote in message news:njGcg.1081
Two reasons:

I'm sick of buying oil. The last thing I need is to have to buy
$40/gallon oil.



You might feel sicker when you have to buy Yamaha's $25 oil filter for each
oil change. The manual recommends every 6 months or 100 hrs. WHICHEVER COMES
FIRST. It also says to change more often if you do a lot of low speed
running or trolling.