tried to copy out of the merc manual.
I don't use the oil mix just sta-bil marine, use fogging oil instead and add antifreeze with corrosion inhibitor.
I have a MPI with the single point drain system.
NOTE: Use this procedure if your engine is not equipped with an air actuated single point
drain system or if the single point drain system fails.
1. Remove three blue drain plugs: One from the distribution housing (lower front, port side)
and two from the seawater pickup pump (front, starboard side).
77917 77908
a
a
a - Blue Drain Plug
2. Verify that water is draining from each opening.
3. Allow the system to drain for a minimum of 5 minutes. Mercury MerCruiser recommends
leaving the plugs out while transporting the boat or while performing other maintenance
to ensure that all water is drained.
4. Crank engine over slightly with starter motor to purge any water trapped in seawater
pickup pump. Do NOT allow engine to start.
5. Prior to launching boat or starting the engine, close the drain system by re-installing the
three blue drain plugs.
All Models
1. For additional assurance against freezing and corrosion, fill the cooling system with a
mixture of propylene glycol antifreeze and tap water mixed to manufacturer’s
recommendation to protect engine to the lowest temperature to which it will be exposed
during cold weather or extended storage.
a. Remove thermostat housing or hose and fill with propylene glycol coolant until
engine block is full. If thermostat housing was removed,
1. In a 23 l (6 U.S. gal.) remote fuel tank mix:
a. 19 l (5 U.S. gal) regular unleaded 87 octane (90 RON) gasoline
b. 1.89 l (2 U.S. qts.) Premium Plus 2-Cycle TC-W3 Outboard Oil
c. 150ml (5 ounces) Fuel System Treatment and Stabilizer or 30 ml (1 ounce) Fuel System
Treatment and Stabilizer Concentrate.
Description Where Used Part Number
Mercury Fuel System Treatment
and Stabilizer
Fuel System 92-802875A1
Mercury Fuel System Treatment
and Stabilizer Concentrate
Fuel System 92-802876A1
Premium Plus 2-Cycle TC-W3
Outboard Oil
Fuel System 92-802824A1
2. Allow the engine to cool down.
3. Activate the Schrader valve to relieve fuel pressure.
4. Close the fuel shut-off valve, if equipped. Disconnect and plug the fuel inlet fitting if not
equipped with a fuel shut-off valve.
5. Connect the remote fuel tank (with the fogging mixture) to the fuel inlet fitting.
IMPORTANT: Supply cooling water to the engine.
6. Start and operate the engine at 1300 rpm for 5 minutes.
7. After specified operating time is complete, slowly return throttle to idle rpm and shut
engine off.
IMPORTANT: Ensure that some fogging mixture remains in the engine. Do NOT allow
the engine’s fuel system to become completely dry.
8. Remove and discard the water separating fuel filter.
9. Install a new filter.