octane?

[Mark Northcutt]

HAD A 1987 MERC 175 CARB THAT SAID IN OWNERS MANUAL TO USE SUPER PREMIUM FUEL 91 OCTANE.
NOW IVE GOT A 1999 MERC XR6 150 WITH NO OWNERS MANUAL. WHAT OCTANE DOES MERC RECOMEND FOR THIS MOTOR? OR DOES IT MATTER ? THANKS MARK

 

[Johncatchingpigs]

HAD A 1987 MERC 175 CARB THAT SAID IN OWNERS MANUAL TO USE SUPER PREMIUM FUEL 91 OCTANE.
NOW IVE GOT A 1999 MERC XR6 150 WITH NO OWNERS MANUAL. WHAT OCTANE DOES MERC RECOMEND FOR THIS MOTOR? OR DOES IT MATTER ? THANKS MARK

Mark i have a 2001 mercury xr6 150 and mixed my gas&oil. 50:1.
My owners man, says 87 octane, I haven't had any problems with this, also would look at get water separated if u don't have one. Hope this helps

 

[Larry Williams]

http://www.mercurymarine.staging.yartdigital.com/home/service-warranty/service-maintenance/fuel-oils-recommendations-outboards.aspx