Engine Oil Recommendations; Checking And Adding Engine Oil - Mercury 25 EFI FourStroke User Manual

Engine Oil Recommendations

We recommend the use of Mercury or Quicksilver NMMA FC‑W
certified 10W‑30 4‑Stroke Outboard Oil for general,
all‑temperature use. If NMMA certified synthetic blend 25W‑40
4‑Stroke outboard oil is preferred, use Mercury or Quicksilver
synthetic blend 4‑Stroke Outboard Oil. If the recommended
Mercury or Quicksilver NMMA FC‑W certified outboard oils are
not available, a major FC‑W certified 4‑stroke outboard oil may
be used.
IMPORTANT: The use of detergent oils, multi‑viscosity oils
(other than Mercury or Quicksilver NMMA FC‑W certified oil or a
major brand NMMA FC‑W certified oil), synthetic oils, low quality
or oils that contain solid additives are not recommended.
F° C°
+38
+100
+27
+80
+16
+60
+40 +4
+20 –7
–18
0

Checking And Adding Engine Oil

IMPORTANT: Do not overfill. Be sure that the outboard is upright
(not tilted) when checking oil.
1. Turn the engine off. Have the outboard in a level operating
position. Remove the top cowl.
FUEL AND OIL
b
a
26795
Recommended SAE viscosity
for engine oil
a - NMMA FC‑W certified
25W‑40 4‑stroke outboard
oil may be used at
temperatures above 4 °C
(40 °F)
b - NMMA FC‑W certified
10W‑30 4‑stroke outboard
oil is recommended for use
in all temperatures.
54
eng