899883192 - Valiant
899883192 - Valiant
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 />
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