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Max Online: 36273 @ 01/23/13 02:34 PM
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#11417079 - 02/16/16 07:30 AM Mercury Pro XS Gasoline Question
BB675 Offline

Registered: 06/23/14
Posts: 78
Loc: Orange, Texas
My buddy has a 2012 250 Pro XS that recently shot a rod, therefor causing it to fail. Upon taking it to a local mechanic to do the warranty work in putting a new powerhead in, the mechanic told him that this is not covered under warranty because he was running premium gasoline.

The reason the mechanic gave him for the motor failure was the fuel to air ratio.

The question I have is, should I not be running Plus or Premium gasoline in my Mercury? Could this cause it to over heat?

I was always told to run the highest grade gasoline in my outboards.

#11417100 - 02/16/16 07:40 AM Re: Mercury Pro XS Gasoline Question [Re: BB675]
6BOOMER Online   content
Pro Angler

Registered: 01/16/12
Posts: 610
Loc: Del Rio, Tx
This is posted on the BBC, not sure if it will cause an overheat.

-All models- MAXIMUM ETHANOL CONTENT: 10%. Ethanol content may adversly affect engine performance.
-See "Mercury's View of Ethanol" on Sherm's board at:
-Standard Opti's (ALL) 87 Octane MINIMUM.
-Standard 2-stroke Carb/EFI Models: 87 Octane MINIMUM.
-XS, XB or Racing PRIOR to 2006- CONSULT OWNER'S MANUAL! Most require High-Test!
-ProXS and 250XS 2006-UP: 87 Octane MINIMUM. IF poor idle quality occurs, could can try 89 Octane (mid-grade) to see if quality improves.
-300XS- Consult Owner's Manual. High Grade (minimum 91 Octane) fuel required!

#11417285 - 02/16/16 08:56 AM Re: Mercury Pro XS Gasoline Question [Re: BB675]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10519
Loc: Littlefield Tx & Lake A. H. US...
Don`t think so. Only warranty issue I am aware of on fuel is 15% or more on ethanol. Premium fuel leaves more carbon requiring a carbon cleaner like Sea Foam in the fuel except for Chevron. They have techtron (ring free)in there fuel. Carbon is death to a 2 cycle motor if left untreated.
“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” GOD IS GOOD

#11417975 - 02/16/16 02:10 PM Re: Mercury Pro XS Gasoline Question [Re: BB675]
TLW Offline
Extreme Angler

Registered: 11/16/06
Posts: 2004
Loc: ft worth
read this.... go to tha "fuel and oil" part.... know several that run 91/92 exclusively in pro xs's with no warranty might apply to non ethanol fuels... 87 is minimum.... that mechanic is full of it!

Edited by TLW (02/16/16 04:38 PM)


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