MerCruiser 350 Magnum MPI, Operation & Maintenance Manual

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CA261
Specifications
Fuel Recommendations
IMPORTANT: Use of improper gasoline can damage your engine seriously. Engine damage resulting from
use of improper gasoline is considered misuse of engine, and damage caused thereby will not be covered
under the limited warranty.
FUEL RATINGS
MerCruiser engines will operate satisfactorily when using a major brand of unleaded gasoline as follows:
USA and Canada - having a posted pump Octane Rating of
87 (R+M)/2 minimum. Premium gasoline [92 (R+M)/2 Octane] is also acceptable. DO NOT use leaded gasoline.
Outside USA and Canada - having a posted pump Octane Rating of 90 RON minimum. Premium gasoline (98
RON) is also acceptable. If unleaded gasoline is not available, use a major brand of leaded gasoline.
CA291
USING REFORMULATED (OXYGENATED) GASOLINES (USA ONLY)
This type of gasoline is required in certain areas of the USA. The two types of “oxygenates” used in these fuels
is Alcohol (Ethanol) or Ether (MTBE or ETBE). If Ethanol is the “oxygenate” that is used in the gasoline in your area,
refer to “Gasolines Containing Alcohol” also.
These “Reformulated Gasolines” are acceptable for use in your MerCruiser engine.
CA277
GASOLINES CONTAINING ALCOHOL
If the gasoline in your area contains either “methanol” (methyl alcohol) or “ethanol” (ethyl alcohol), you should be
aware of certain adverse effects that can occur. These adverse effects are more severe with “methanol”. Increasing
the percentage of alcohol in the fuel can also worsen these adverse effects.
Some of these adverse effects are caused because the alcohol in the gasoline can absorb moisture from the air,
resulting in a separation of the water/alcohol from the gasoline in the fuel tank.