OEM Service Parts for MerCruiser 4.3L V6
Year Range: 2002-Present
Model: MerCruiser 4.3L MPI
Serial Range: 0M300000 thru 1A637496 +
Shop OEM Service Parts & Kits
Oil Filter 35‑866340Q03
Fluid / Filter
Ignition
Spark plugs are sold individually. Select based on brand preference.
Cooling System
Part Fitment Verification
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Closed Cooling System only use kit 040-80004
Sleeve 23-8M0124947 used w/ 807252Q5 ONLY
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