OEM Service Parts for MerCruiser 3.0L
Year Range: 1998-2003
Model: MerCruiser 3.0L (Carb)
Serial Range: 0L010042 thru 0W301999
Shop OEM Service Parts & Kits
Fluid / Filter
Cooling System
Part Fitment Verification
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Serial Number: 0L340999 And Below
140°F Thermostat Kit 59078Q3
Serial Number: 0L341000 And Up
160°F Thermostat Kit 807252Q5
Thermostat Housing Sleeve 23-8M0214947
Ignition
Belts / Accessories
Part Fitment Verification
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Serial Number: 0L382121 And Below
40" V-Belt 57-69143Q
Serial Number: 0L382122 and Above
39.5" V-Belt 57-862054Q
Recommended Service Guide
Ignition Replacement Interval
Spark Plugs:
Every 1-2 years or 300 hours
Distributor Cap/Rotor:
Inspect annually, Replace every 2-3 years or if contacts are corroded
Spark Plug Wires:
Inspect annually, Replace every 3-5+ years or if cracked, corroded, or misfiring.
Belt Replacement Interval
Belts:
Inspect annually. Replace every 3-5+ years or if worn, cracked, or frayed.
Fluid / Filter Replacement Interval
Oil + Filter:
Annually or 100 hours
Fuel Filter:
Annually or 100 hours
Power Steering Fluid:
Inspect and top off annually(if equipped) Replace fluid if discolored, burnt, or contaminated
Cooling System Replacement Interval
Thermostat:
Freshwater use: Every 3–5 years
Saltwater use: Every 1–2 years
Gaskets:
Replace gaskets if rust streaks or staining is present at joints
Disclaimer: This is not a full service list, only suggested intervals for common components. Always follow official MerCruiser manuals for complete maintenance