Mercury 350 MAG MPI Horizon, Service Manual

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CC989
Changing Fluids
Refer to Maintenance for change interval. Crankcase oil should be changed before placing boat in storage.
Changing Crankcase Oil and Filter
CAUTION
ENVIRONMENTAL HAZARD! Discharge of oil or oil waste into the environment is restricted by law. Do
not spill oil or oil waste into the environment when using or servicing your boat. Contain and dispose
of oil or oil waste as defined by local authorities.
IMPORTANT: Change crankcase oil when engine is warm from operation. Warm oil flows more freely,
carrying away more impurities. Use only recommended engine oil (refer to Specifications).
1
With engine at normal operating temperature, remove dipstick. Install Quicksilver Crankcase Oil Pump onto
dipstick tube.
2
Insert hose end of crankcase oil pump into an appropriate container and using handle, pump until crankcase
is empty. Remove crankcase oil pump.
NOTE: Alternately the crankcase oil may be drained using the oil pan drain plug and a suitable container placed
under the engine. Tighten the oil pan drain plug securely upon installation.
3
Remove and discard old oil filter and old sealing ring.
4
Coat sealing ring on new oil filter with new engine oil. Install new oil filter. Tighten oil filter securely. Hand
tighten only, do not use a filter wrench. DO NOT overtighten.
5
Remove oil filter cap. Add recommended engine oil to bring level up to, but not over FULL or OK RANGE
mark on dipstick. Refer to Specifications.
IMPORTANT: Always use dipstick to determine exactly how much oil is required.
6
Start engine and check for leaks.