Oil Recommendation - Mercury 40 TwoStroke Operation, Maintenance And Installation Manual

Fuel leakage is a fire or explosion hazard, which can cause serious injury or
death. Periodically inspect all fuel system components for leaks, softening,
hardening, swelling, or corrosion, particularly after storage. Any sign of
leakage or deterioration requires replacement before further engine
operation.
IMPORTANT: If you use gasoline that contains or might contain methanol or
ethanol, you must increase the frequency of inspection for leaks and
abnormalities.
IMPORTANT: When operating a Mercury Marine engine on gasoline containing
methanol or ethanol, do not store the gasoline in the fuel tank for long periods.
Cars normally consume these blended fuels before they can absorb enough
moisture to cause trouble; boats often sit idle long enough for phase separation
to take place. Internal corrosion may occur during storage if alcohol has
washed protective oil films from internal components.

Oil Recommendation

Recommended Oil
IMPORTANT: Oil must be NMMA certified TC‑W3 2‑Cycle oil.
Mercury or Quicksilver Premium TC‑W3 2‑Cycle oil is recommended for this
engine. For added protection and lubrication, Mercury or Quicksilver Premium
Plus TC‑W3 2‑Cycle oil is recommended. If Mercury or Quicksilver outboard oil
is not available, substitute another brand of 2‑cycle outboard oil that is NMMA
Certified TC‑W3. Severe engine damage may result from use of an inferior oil.
Non‑Oil Injected Models: MH, EH
Add engine oil into the fuel tank. The mixing ratio with gasoline is 50:1 (50 parts
gasoline and one part oil). Mix well by hand. The mixing ratio during break‑in
running is 25:1.
Mixing ratio
During break‑in
After break‑in
Pour oil into the fuel tank.
Pour gasoline into the fuel tank.
ENGINE BREAK-IN
Engine Break‑in Fuel Mixture
Use a 25:1 gasoline/oil mixture in the first tank of fuel.
FUEL AND OIL
WARNING
!
Mercury or Quicksilver Premium 2‑Cycle TC‑W3
Outboard Oil
40
Gasoline
25
50
Engine Oil
1
1
eng