Engine Oil; Checking; Filling - Mercury 4.2 Diesel Operation & Maintenance Manual

Engine Oil

Discharge of oil, coolant, or other engine/drive fluids into the environment is restricted by law. Use caution not to spill oil,
coolant, or other fluids into the environment when using or servicing your boat. Be aware of the local restrictions governing
the disposal or recycling of waste, and contain and dispose of fluids as required.

Checking

IMPORTANT: Check the engine oil at the intervals specified by the maintenance schedule. It is normal for an engine to use a
small amount of oil during operation. The amount of oil consumed depends upon engine speed. Oil consumption is the highest
at wide open throttle and decreases substantially as engine speed is reduced.
With the engine running, the crankshaft journals or rod journals may strike and break the dipstick, resulting in damage to
internal engine components. Stop the engine completely before removing or inserting the dipstick.
1. To check the engine oil level during operation, stop the engine and allow five minutes for the oil to drain into the pan.
2. Remove the dipstick, wipe clean, and reinstall.
3. Remove the dipstick and observe the oil level. The oil level must be between the marks on the dipstick. If necessary, add
oil. Refer to Filling.
b
a

Filling

IMPORTANT: Do not overfill the engine with oil.
1. Remove the oil fill cap.
c
b
a
2. Add the specified oil to bring the oil level up to, but not over, the maximum mark on the dipstick.
90-8M0113988 DECEMBER 2015
eng
NOTICE
NOTICE
Typical
a - Engine cover
d
b - Oil fill cap
c - Access panel removed
d - Engine oil dipstick
37281
Section 4 - Maintenance
Typical
c
a - Oil fill cap
b - Dipstick
c - Maximum mark
d
d - Minimum mark
37285
Page 35