OEM Service Parts for MerCruiser 4.3L V6
✅ Verified Fit for Your Engine
Year Range: 2002+
Model: MerCruiser 4.3L MPI V6
Serial Range: 0M300000 thru 1A063240+
Oil Capacity: 4.0 US qt (3.8 L)
Shop OEM Service Parts & Kits
Oil Filter 35‑866340Q03
Fluid / Filter
OEM Mercury / MerCruiser Fuel Water Separating Filter 35-802893Q01
Replacement water separating fuel filter for all MerCruiser sterndrive and inboard engines except 3.0L and 1992 4.3L engines equipped with an inline fuel filter.
Don’t let water moisture or other fuel contaminants rob horsepower from your engine. Filter those particles before they can get to your engine. Includes replacement filter and rubber gaskets for installation.
25 micron filtering elements remove damaging or performance-robbing fuel-borne contaminants
Polyester/cellulose/glass fiber with phenolic binder coated with silicon
Produced to meet Mercury Marine original equipment manufacturer specifications to best protect your engine
MerCruiser engine oil change kit contains only OEM components. Oil + filter for all 3.0L engines and 4.3L MPI V6
What’s included: (1) gallon of Quicksilver marine 25W-40 engine oil, (1) Quicksilver 35‑866340Q03 oil filter
Quicksilver marine 25W-40 FC-W Synthetic Blend engine oil:
Specialized additive package outperforms automotive oils in marine environments, delivering the best wear and corrosion protection even under extreme RPM, high temperatures, and heavy loads.
Recommended by Mercury Marine and exceeds all marine engine oil requirements. Continued use helps eliminate thermal breakdown and ensures long-term protection during high-output operation.
This FC‑W Catalyst Compatible formula maintains peak engine performance and reliability without damaging emissions systems — safe for engines with or without catalytic converters.
Quicksilver 35‑866340Q03 oil filter:
Meets all Mercury Marine OEM specifications and is recommended for use with Quicksilver oils and lubes.
Engineered for high‑performance marine use, this filter features M‑Pleated cleansing media to trap harmful contaminants and protect engine internals. The anti‑drain back valve ensures startup lubrication and eliminates dry starts.
Its metal shell is over 50% thicker than conventional filters, with a durable paint finish that resists corrosion—even in saltwater environments.
Change your oil filter every 100 hours or once per season for best protection.
Quicksilver Power Trim & Steering Fluid 92-858075Q01 is formulated for use in marine power‑trim and hydraulic steering systems that specify ATF‑type fluid. Its unique blend helps protect internal components by resisting corrosion, oxidation, and wear, even in high‑temperature operating conditions. This fluid delivers smooth, reliable trim and steering performance and is recommended by Mercury Marine for compatible systems. **Not for use in applications requiring SAE 0W‑30 oil.
Size: (1) Quart, 32 oz
For use in power trim and steering systems where ATF is recommended.
Unique formula helps prevent corrosion, oxidation and wear.
Compatible with all hydraulic fluids.
Prevents foaming.
Suitable for high-temperature applications.
Recommended by Mercury Marine.
OEM MerCruiser 35‑866340Q03 oil filter for MerCruiser sterndrive and inboard engines, including GM‑based 4‑cylinder and V6/V‑8 models, plus Mercury 4.5L and 6.2L. (Excludes V‑6 engines with block‑mounted filters)
Meets all Mercury Marine OEM specifications and is recommended for use with Quicksilver oils and lubes.
Engineered for high‑performance marine use, this filter features M‑Pleated cleansing media to trap harmful contaminants and protect engine internals. The anti‑drain back valve ensures startup lubrication and eliminates dry starts.
Its metal shell is over 50% thicker than conventional filters, with a durable paint finish that resists corrosion—even in saltwater environments.
Change your oil filter every 100 hours or once per season for best protection.
OEM MerCruiser 4-Stroke FC-W Synthetic Blend 25W-40 (1 gallon) marine engine oil engineered for Mercury and MerCruiser 4‑stroke engines. Quicksilver 8M0078623 25W40 marine engine oil specialized additive package outperforms automotive oils in marine environments, delivering the best wear and corrosion protection even under extreme RPM, high temperatures, and heavy loads.
Recommended by Mercury Marine and exceeds all marine engine oil requirements. Continued use helps eliminate thermal breakdown and ensures long-term protection during high-output operation.
This FC‑W Catalyst Compatible formula maintains peak engine performance and reliability without damaging emissions systems — safe for engines with or without catalytic converters.
For optimal results, pair with Quicksilver oil filters to match flow rate and filtration performance.
Ideal for routine oil changes, seasonal prep, and protecting your investment in harsh marine conditions.
OEM MerCruiser 4-Stroke FC-W Synthetic Blend 25W-40 (1 quart) marine engine oil engineered for Mercury and MerCruiser 4‑stroke engines. Quicksilver 8M0078622 marine 25W-40 engine oil specialized additive package outperforms automotive oils in marine environments, delivering the best wear and corrosion protection even under extreme RPM, high temperatures, and heavy loads.
Recommended by Mercury Marine and exceeds all marine engine oil requirements. Continued use helps eliminate thermal breakdown and ensures long-term protection during high-output operation.
This FC‑W Catalyst Compatible formula maintains peak engine performance and reliability without damaging emissions systems — safe for engines with or without catalytic converters.
For optimal results, pair with Quicksilver oil filters to match flow rate and filtration performance.
Ideal for routine oil changes, seasonal prep, and protecting your investment in harsh marine conditions.
Ignition
OEM MerCruiser spark plug ignition wire set 84-863656A2 is for use on V6 4.3L MPI engines.
Spark plug set 84-863656A2 is for use on 4.3L MPI MerCruiser sterndrive engines.
Complete set of spark plug wires with boots at spark plug end
Tailored to reach the correct plug location
Designed for efficiency, endurance and durability in a marine engine environment
OEM MerCruiser distributor cap and rotor kit 898253T28 for 4.3L MPI engines.
Kit includes distributor cap, rotor, and replacement hardware. Distributor cap kit 898253T28 fits MerCruiser 4.3L engines with multi-point electronic fuel injection (MPI). See your owner’s manual for replacement information and directions.
Cap is made from a blend of PBT and PET plastics for increased strength, stiffness and resistance to warpage
Solid brass inserts resist corrosion and electrical pitting for long service life
Designed to resist RFI interference with onboard electronics
High strength-to-weight ratio rotor is designed for durability and resistance to thermal cracking
OEM MerCruiser spark plug: NGK 5599 ITR4A-15 (Mercury part numbers: 8M2018369, 8M0204739)
Fits Select MerCruiser: 4.3L, 5.0L, 5.7L, and 6.2L MPI engines (2001 & newer)
Genuine NGK spark plug
Spark plugs come pre-gapped.
Iridium at the fine-wire center electrode and platinum at the ground electrode provides maximum durability and performance
The platinum at the ground electrode adds extra protection against plug wear and gap erosion
Sold individually (price is per plug)
Model: 5599
OEM Quicksilver/Mercury Engine Starter 863007A1 (Replaces 50-806964A3 & 50-806964A4)
Starter motor assembly 863007A1 can be used on V6 and V8 MerCruiser engines made by General Motors (1983-2016). It will also fit MerCruiser 3.0L sterndrive engines (1999-2015). See your owner's manual or service manual for specific applications and replacement instructions.
This starter motor assembly features an 11-tooth pinion; it is for bottom mount installations with offset bolt pattern
Same starter assembly as originally installed on your engine
Designed and built for marine engine applications
Produced to meet Mercury Marine original equipment manufacturer specifications to maximize the performance of your Mercury and Mariner outboard or MerCruiser sterndrive
OEM MerCruiser ignition coil 8M0054588
Ignition coil 8M0054588 is for MerCruiser sterndrive and inboard MPI engines in these models: 4.3L, 5.0L, 6.2L having ECM 555 (model year 2001 and newer, serial No. 0M300000-2A455878). See your service or parts manual for specific applications.
Ignition coil for select MerCruiser sterndrive and inboard engines
Produced to meet Mercury Marine original equipment manufacturer specifications to maximize the performance of your MerCruiser sterndrive
Cooling System
OEM MerCruiser blue plastic drain plug 8M0119211. Sold individually (price is per plug).
Cylinder block and exhaust manifold drain plug 8M0119211 is for MerCruiser sterndrive and inboard engines. The wing nut design makes insertion or removal easier. An o-ring is included and must be used to ensure proper seal when inserted.
Blue plastic, wing nut style drain plug with o-ring for easy replacement or removal
Produced to meet Mercury Marine original equipment manufacturer specifications to maximize the performance of your Mercury and Mariner outboard or MerCruiser sterndrive
OEM MerCruiser thermostat housing sleeve 23-8M0214947
Fits most MerCruiser 3.0L, 5.0L, 5.7L, 6.2L, 7.4L and 8.2L stern drive and inboard engines made by General Motors having standard cooling systems. The sleeve supports the thermostat in the thermostat housing. The sleeve is made with polybutylene terephthalate (PBT), a thermoplastic polymer, to withstand the temperatures in the engine and deliver long service life.
OEM MerCruiser thermostat kit 807252Q5 includes 160°F thermostat and necessary gaskets / seals for replacement.
Fitment: V6 and V8 MerCruiser engines made by GM (model year 1987-2016) with standard cooling. 4 cylinder 3.0L / TKS / MPI 1998+ with standard cooling
Proper engine cooling temperature ensures peak performance and highest efficiency
Use only the temperature thermostat listed in your owner's manual or service manual
Easy to replace with common shop tools
See your owner's manual for removal of non-functioning thermostat and replacement of new thermostat
Produced to meet Mercury Marine original equipment manufacturer specifications
Part Fitment Verification
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| Cooling Type | Thermostat Kit | Sleeve |
|---|---|---|
| Standard (Raw) | 807252Q5 | 23-8M0124947 |
| Closed | 040-80004 | N/A |
Recommended Service Guide
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
Cooling System 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
Fluid / Filter 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.
Ignition Replacement Interval
Belts:
Inspect annually. Replace every 3-5+ years or if worn, cracked, or frayed.
Belt Replacement Interval
Disclaimer: This is not a full service list, only suggested intervals for common components. Always follow official MerCruiser manuals for complete maintenance