Checking Engine Oil; Changing Engine Oil; Engine Oil Capacity; Oil Changing Procedure - Mercury FourStroke 2.5 Service Manual

Checking Engine Oil

IMPORTANT: Do not overfill. Be sure that the outboard is upright (not tilted) when checking oil.
1. Position the outboard so it is sitting level.
2. Verify the oil level through the oil level inspection window. If the oil level is down toward the lower level mark, remove the
oil fill cap, and fill up to the upper level mark.
NOTE: If oil level is at the lower mark, add 100 ml (3 oz.) of oil.
3. Reinstall the oil fill cap, and tighten securely.
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Changing Engine Oil

Engine Oil Capacity

Engine oil capacity is approximately 300 ml (10 fl. oz.).

Oil Changing Procedure

1. Place outboard in an upright (not tilted) position.
2. Turn the outboard to gain access to the drain plug. Remove drain plug and drain engine oil into an appropriate container.
Lubricate the seal on the drain plug with oil and reinstall.
IMPORTANT: Inspect oil for signs of contamination. Oil contaminated with water will have a milky color to it; oil
contaminated with fuel will have a strong fuel smell. If contaminated oil is noticed, have the engine checked by your dealer.
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Oil Filling

IMPORTANT: Do not overfill. Be sure that the outboard is upright (not tilted) when checking oil.
Remove the oil fill cap and refill with 300 ml (10 fl. oz.) of oil. Reinstall the oil fill cap.
Idle engine for five minutes and check for leaks. Stop engine and check oil level. Add oil if necessary.
90-8M0065421 NOVEMBER 2012
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a - Oil level inspection window
b - Upper oil level
c - Lower oil level
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a - Oil fill cap
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a - Drain plug
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Maintenance
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