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899883192 - Valiant

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Section 4 - Specifications<br />

Cruising RPM<br />

Material and design advancements allow modern inboard engines operate at higher engine<br />

speeds than their predecessors. Increased RPM significantly increases the horsepower of<br />

these new engines and is a critical part performance and efficiency. The materials and<br />

design of the new engines allow these higher speeds without durability penalty.<br />

Over‐propping the boat to reduce its cruising RPM to previous levels increases the engine's<br />

susceptibility to engine damage from detonation and pre‐ignition. The recommended<br />

cruising RPM ranges are:<br />

Cruising RPM for peak efficiency<br />

Model<br />

RPM range<br />

Fuel Requirements<br />

Fuel Ratings<br />

5.7 MPI and Horizon 5.7 3400–3800<br />

NOTICE<br />

Running out of fuel can damage catalyst components. Do not allow the fuel tanks to<br />

become empty during operation.<br />

IMPORTANT: Use of improper gasoline can damage your engine. Engine damage<br />

resulting from the use of improper gasoline is considered misuse of the engine and<br />

will not be covered under the limited warranty.<br />

Mercury MerCruiser engines will operate satisfactorily with any major brand of unleaded<br />

gasoline that meets the following specifications:<br />

USA and Canada ‐ A posted pump Octane Rating of 87 (R+M)/2, minimum. Premium<br />

gasoline 92 (R+M)/2 Octane is also acceptable. Do not use leaded gasoline.<br />

Outside USA and Canada ‐ A posted pump Octane Rating of 91 RON, minimum. Premium<br />

gasoline (98 RON) is also acceptable. If unleaded gasoline is not available, use a major<br />

brand of leaded gasoline.<br />

Using Reformulated (Oxygenated) Gasoline (USA Only)<br />

Gasoline Containing Alcohol<br />

Reformulated gasoline is required in certain areas of the USA and are acceptable for use<br />

in your Mercury MerCruiser engine. The two types of oxygenates used in these fuels are<br />

alcohol (ethanol) and ether (MTBE or ETBE). If ethanol is the oxygenate that is used in the<br />

gasoline in your area, refer to Gasoline Containing Alcohol.<br />

If the gasoline in your area contains either methanol (methyl alcohol) or ethanol (ethyl<br />

alcohol), be aware of possible adverse effects. These adverse effects are more severe with<br />

methanol and worsen according to the percentage of alcohol in the fuel.<br />

Alcohol in gasoline can absorb moisture from the air, causing the water and the alcohol to<br />

separate from the gasoline in the fuel tank.<br />

IMPORTANT: The fuel system components on your Mercury MerCruiser engine will<br />

withstand up to 10% alcohol content in the gasoline. We do not know what percentage your<br />

boat's fuel system will withstand. Contact your boat manufacturer for specific<br />

recommendations on your boat's fuel system components (fuel tanks, fuel lines, and<br />

fittings).<br />

Be aware that gasoline containing alcohol may cause increased:<br />

Page 58 90-<strong>899883192</strong> NOVEMBER 2008

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