What type of fuel can I use?

MerCruiser engines will operate satisfactorily when using a major brand of automotive unleaded fuel meeting the following specifications:

• Posted Pump Octane Rating of 91 RON minimum.
• Premium Unleaded Petrol (PULP 95 RON) is also acceptable.
• Consult the Owner's Manual for more details

Use the following chart to determine correct fuel for engines prior to 2001 

Notes:

1.        The cylinder heads on these engines have hardened exhaust valve seat inserts.

2.        If petrol with alcohol must be used, periodically inspect complete fuel system for leaks and do not store fuel in boat's fuel tank for long periods of time.

3.        To increase valve life on all MerCruiser engines, the following recommendations should be considered:

• Use a propeller that allows engine to operate at or near the top of its maximum RPM range when at full throttle with a normal boat load.
• Operation at 3/4 throttle setting or lower is recommended. Refrain from prolonged operation at maximum (full throttle) RPM.

What type of oil should I use? Can I use synthetic oil?

Engine Oil

To help obtain optimum engine performance and to provide maximum protection, we strongly recommend the use of the following oils listed in the order of recommendation:

1.        MerCruiser / Quicksilver Synthetic Blend, NMMA FC-W rated, 4 cycle oil.

2.        MerCruiser / Quicksilver 25W40 NMMA FC-W rated oil.

3.        A NMMA FC-W rated oil.

4.        MerCruiser / Quicksilver 4-cycle 25W40, non FC-W rated oil.

Note: The use of non-detergent oils, multi-viscosity oils (other than as specified), non-FC-W rated synthetic oils, low quality oils or oils that contain solid additives are specifically not recommended