Fuel Additives; Fuel Requirements; Avoiding Fuel Flow Restriction; Filling Remote Oil Tank - Mercury 135 Optimax User Manual

Mercury Optimax/DFI or Quicksilver DFI 2‑Cycle Engine Oil is recommended for your engine. If Mercury Optimax/
DFI or Quicksilver DFI 2‑Cycle engine oil is not available, we recommend using Mercury or Quicksilver TC‑W3
Premium Plus 2‑Cycle Oil. Severe engine damage may result from use of an inferior oil.

Fuel Additives

To minimize carbon deposit buildup in the engine, it is recommended to add Mercury or Quicksilver Quickleen
Engine Treatment additive to the engine's fuel at each tank fill throughout the boating season. Use additive as
directed on container.

Fuel Requirements

Do not use pre‑mixed gas and oil in this engine. The engine automatically receives extra oil during engine break‑in.
Use a fresh supply of the recommended gasoline during engine break‑in and after engine break‑in.

Avoiding Fuel Flow Restriction

IMPORTANT: Adding components to the fuel supply system (filters, valves, fittings, etc.) may restrict the fuel flow.
This may cause engine stalling at low speed, and/or a lean fuel condition at high RPM that could cause engine
damage.

Filling Remote Oil Tank

Remove filler cap and fill with the specified oil. Oil tank capacity is 11.5 liters (3 gallons). Replace filler cap and
tighten securely.
IMPORTANT: Always make sure the oil tank caps are threaded on tight. An air leak will prevent oil flow to the
engine.

Filling Engine Mounted Oil Reservoir Tank

NOTE: Filling this tank is only necessary if the oil level should ever drop and the low oil warning system is activated.
1. Remove the top cowl.
2. Loosen the fill cap on the engine oil reservoir tank. Run the engine until all the air has been vented out of
the oil reservoir tank and tank is filled with oil to the point of overflow.
3. Re‑tighten the fill cap. Stop the engine and replace the top cowl.
FUEL AND OIL
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