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Mercury OptiMax Pro XS 200 / 225 / 250 (3.0L) service guide

Oil, gear oil, spark plugs and the service schedule for the Mercury OptiMax Pro XS 200 / 225 / 250 (3.0L) (200 to 250 hp, two-stroke), from the factory service manual, plus how we service it in Hawaiʻi.

Models covered: Mercury 200, 225 and 250 OptiMax Pro XS, 3.0L 60° V6 direct fuel injection 2-stroke, 3046 cc, serial 1B973744 and above; Standard, Torque Master and Torque Master II gearcases.

Quick answers

What two-stroke oil does a Mercury OptiMax Pro XS 200 / 225 / 250 use?
OptiMax/DFI 2-Cycle Outboard Oil or Premium Plus 2-Cycle TC-W3.
What gear oil does a Mercury OptiMax Pro XS 200 / 225 / 250 use, and how much?
High Performance Gear Lubricant. Quantity: Standard 970 ml (32.8 fl oz); Torque Master II 1040 ml (35.1 fl oz); Torque Master 828 ml (28.0 fl oz).
What spark plug does a Mercury OptiMax Pro XS 200 / 225 / 250 use?
NGK IZFR6J-11 or IZFR6J, gap 1.09 mm (0.043 in); qty 6. Anti-seize on the threads yearly.
How often should a Mercury OptiMax Pro XS 200 / 225 / 250 be serviced?
The factory schedule lists: Annually or 100 hours; Three years or 300 hours. In Hawaiʻi's salt water we do a full yearly service every 200 hours or 1 year, whichever comes first, and a new engine needs its first (break-in) service.
When should the water pump impeller be replaced on a Mercury OptiMax Pro XS 200 / 225 / 250?
The factory schedule says to replace it at 300 hours. In Hawaiʻi's warm salt water we replace it every 200 hours or 1 year, whichever comes first, because a worn impeller is the most common cause of overheating.
What is the idle speed of a Mercury OptiMax Pro XS 200 / 225 / 250?
575 r/min.
What is the propeller nut torque on a Mercury OptiMax Pro XS 200 / 225 / 250?
75 N·m (55 lb·ft).

Maintenance specs

Injection oilOptiMax/DFI 2-Cycle Outboard Oil or Premium Plus 2-Cycle TC-W3
Gear lubeHigh Performance Gear Lubricant
Gearcase capacityStandard 970 ml (32.8 fl oz); Torque Master II 1040 ml (35.1 fl oz); Torque Master 828 ml (28.0 fl oz)
Fill and vent screws11.3 N·m (100 lb·in)
Gearcase pressure test (no lube)103.4 kPa (15 psi) for 15 minutes without leakage
Spark plugNGK IZFR6J-11 or IZFR6J, gap 1.09 mm (0.043 in); qty 6. Anti-seize on the threads yearly
Spark plug torqueFinger tight plus 1/4 turn, or 27 N·m (20 lb·ft)
Idle speed (in gear)575 r/min
ThermostatOpening 54 °C (130 °F)
Water pressureIdle at least 5.5 kPa (0.8 psi); WOT 69 to 172 kPa (10 to 25 psi); poppet opening 41 kPa (6 psi)
Anode plate screw54 N·m (39.8 lb·ft)
Propeller nut75 N·m (55 lb·ft)
Power trim fluidPower Trim and Steering Fluid or ATF Type F, FA, Dexron II or III. Max leak-down 55 mm (2.2 in) in 24 hours

Service schedule

The factory maintenance intervals, with what is replaced and what is checked at each. Rows marked Hawaiʻi are our shop's yearly service for salt water use.

  1. Annually or 100 hours

    Replace: fuel filter, gear case oil, gear case plug gaskets

    Check: anodes

  2. Every 200 hours or 1 year (our Hawai‘i yearly service) Hawai‘i

    Replace: fuel filter, gear case oil, gear case plug gaskets, water pump impeller

    Check: anodes

  3. Three years or 300 hours

    Replace: fuel filter, air filter, spark plugs, gear case oil, gear case plug gaskets, water pump impeller, drive belts

    Check: anodes

We replace the water pump impeller at every service from 200 hours up, which can be sooner than the factory schedule, because of Hawaiʻi’s warm salt water.

Source: Mercury 3.0L OptiMax Pro XS service manual, 90-8M0122849. Specs can change by model year and serial number, so always confirm your exact model from the serial tag on the clamp bracket.

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