Engine Oil Recommendations; Checking And Adding Engine Oil - Mercury 150 FourStroke Operation & Installation Manual

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

Mercury or Quicksilver NMMA FC‑W or NMMA FC‑W catalyst compatible
certified SAE 10W‑30 Marine 4‑Stroke Engine Oil is recommended for general
all‑temperature use. As an optional choice, Mercury or Quicksilver SAE
25W‑40 Mineral Marine 4‑Stroke Engine Oil or SAE 25W‑40 Synthetic Blend
Marine 4‑Stroke engine oil may be used. If the recommended Mercury or
Quicksilver NMMA FC‑W certified oils are not available, a major outboard
manufacturer's brand of NMMA FC‑W certified 4‑Stroke outboard oil of similar
viscosity may be used.
IMPORTANT: The use of nondetergent oils, multiviscosity oils (other than
Mercury or Quicksilver NMMA FC‑W certified oil or a major brand NMMA FC‑W
certified oil), synthetic oils, low quality oils, or oils that contain solid additives
are not recommended.

Checking and Adding Engine Oil

IMPORTANT: Do not overfill. Tilt outboard out/up past vertical for
approximately one minute to allow trapped oil to drain back to the oil sump. Tilt
outboard to vertical (not tilted) position when checking engine oil. For accurate
readings, check oil only when engine is cold or after engine has not run for at
least an hour.
1. Before starting (cold engine) tilt outboard out/up past vertical to allow
trapped oil to drain back to the oil sump. Allow outboard to remain tilted
for approximately one minute.
2. Tilt outboard to vertical operating position.
3. Remove the top cowl. Refer to Maintenance ‑ Top Cowl Removal and
Installation.
eng
FUEL AND OIL
Engine Oil
+120
+49
+100 +38
+80 +27
+60 +16
+40 +4
-7
+20
-18
0
C
F
6.0 L (6.3 U.S. qt.)
43
58246