Filling Fuel Tank; Engine Oil Recommendations - Mercury 8 Bigfoot 4-Stroke User Manual

Filling Fuel Tank

Avoid serious injury or death from a gasoline fire or explosion. Always stop the engine and do not smoke or
allow open flames or sparks in the area while filling fuel tanks.
Fill fuel tanks outdoors away from heat, sparks, and open flames.
Remove portable fuel tanks from boat to refill them.
Always stop engine before refilling tanks.
Do not completely fill the fuel tanks. Leave approximately 10% of the tank volume unfilled. Fuel will expand in
volume as its temperature rises and can leak under pressure if the tank is completely filled.
PORTABLE FUEL TANK PLACEMENT IN THE BOAT
Place the fuel tank in the boat so the vent is higher than the fuel level under normal boat operating conditions.

Engine Oil Recommendations

We recommend the use of Mercury or Quicksilver SAE 10W‑30 multi‑viscosity 4‑Stroke Outboard Oil for general,
all‑temperature use. If SAE 25W‑40 multi‑viscosity oil is preferred, use Mercury MerCruiser 4‑cycle engine oil or
Quicksilver sterndrive & inboard 4‑cycle engine oil. Never use 4‑cycle engine oil that is not certified to meet or
exceed any one or combination of the following American Petroleum Institute (API) Service Classification SH, SG,
SF, CF‑4, CE, CD, CDII. Severe engine damage may result from use of an inferior oil.
a - SAE 25W‑40 viscosity oil may be used at
temperatures above 4 °C (40 °F)
FUEL AND OIL
WARNING
!
F° C°
+38
+100
+27
+80
+16
+60
+40 +4
+20 –7
–18
0
Recommended SAE Viscosity for Engine Oil
a b
ob00327
b - SAE 10W‑30 viscosity oil is recommended for
use in all temperatures.
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