OEM Service Parts for MerCruiser 3.0L
✅ Verified Fit for Your Engine
Year Range: 1998-2003
Model: MerCruiser 3.0L (Carbureted)
Serial Range: 0L010042 thru 0W301999
Shop OEM Service Parts & Kits
Fluid / Filter
OEM MerCruiser fuel filter kit 8M0046752 fuel filter kit for MerCruiser 3.0L and 4.3L engines with downward mechanical fuel pumps. Includes replacement gaskets and pressure spring.
For most MCM 120/2.5L, 140/3.0L/LX, 3.7L, 3.8L & 4.3L Engines
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.
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 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.
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.
Cooling System
OEM MerCruiser thermostat 59078Q3 kit is for use MerCruiser 3.0L and other inline 4- and 6-cylinder engines made by General Motors. The 2-piece kit includes the thermostat and cork gasket.
140°F thermostat
Includes cork thermostat gasket
Easy to replace with common tools
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
OEM MerCruiser 27-8146801 thermostat housing gasket seals between the thermostat housing and the cylinder head. Ensure a leak-free cooling system.
Fits all 3.0L inline‑4 MerCruiser models.
OEM MerCruiser exhaust elbow gasket Quicksilver 27-997772 is used between the exhaust manifold and elbow on MerCruiser 3.0L engines. Gasket ensures a clean, leak‑free seal that protects your engine from water intrusion and exhaust leaks.
Also fits older GM small‑block V8 (1982 and earlier) and select Ford V8 engines using standard cooling systems
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.
Part Fitment Verification
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⚠️
| Serial Number | Thermostat Kit | Sleeve |
|---|---|---|
| 0L340999 And Below | 140°F Kit: 59078Q3 | N/A |
| 0L341000 And Up | 160°F Kit: 807252Q5 | 23-8M0124947 |
Ignition
OEM MerCruiser distributor cap and rotor kit 811635Q2 for MerCruiser 3.0L engines. Fits 4-cylinder MerCruiser engines made by General Motors with Delco EST (electronic spark timing) ignition systems.
The distributor cap is made from a blend of PBT and PET plastics for increased strength, stiffness and resistance to warpage important in this design of distributor
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 for durability and resistance to thermal cracking
Produced to meet Mercury Marine original equipment manufacturer specifications to best protect your MerCruiser engine
OEM MerCruiser spark plug ignition wire set 816761Q14 for MerCruiser 3.0L engines with Delco EST ignition systems.
Complete set of spark plug wires with boots at spark plug end
Tailored wire lengths for proper plug reach and coil connection
High-grade insulation resists moisture, heat, and abrasion
Corrosion-resistant terminals for long service life
Positive-click boots confirm secure spark plug connection
Designed for efficiency, endurance, and marine-grade durability
AC Delco MR43LTS marine spark plug. Sold individually (price is per plug).
OEM part number: 33-862029
Made by AC Delco with nickel alloy tip, copper core and ribbed suppressor seal for durability and performance
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 898253T27 for 1990+ 3.0L and select V6 & V8 MerCruiser engines
Ignition coil 898253T27 is for MerCruiser engines made by General Motors with the Delco ignition system. 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
OEM Quicksilver/Mercury Engine Starter 8M0090697
Starter motor assembly 8M0090697 can be used on inline 4-cylinder and 6-cylinder MerCruiser engines made by General Motors (1963-1998). This starter motor assembly features an 11-tooth pinion. It is for bottom mount installations with straight across bolt pattern. 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 straight across 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
Part Fitment Verification
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| Serial Number | Starter Motor |
|---|---|
| 0L096999 And Below | 8M0090697 |
| 0L097000 And Up | 863007A1 |
Belts / Accessories
OEM MerCruiser power steering 37” V-belt 57-65607Q. Fits all MerCruiser 3.0L sterndrive engines equipped with power steering.
Produced to meet Mercury Marine original equipment manufacturer specifications to maximize the performance of your MerCruiser sterndrive
OEM MerCruiser 40” V-belt 57-69143Q. Fits multiple MerCruiser sterndrive and inboard engines.
Replace worn or damaged belts to maintain proper function of engine systems driven by the belt. Easy to install using common tools.
Produced to meet Mercury Marine original equipment manufacturer specifications to maximize the performance of your MerCruiser sterndrive
OEM MerCruiser 39.5” V-belt 57-862054Q. Fits MerCruiser 3.0L TKS and MPI engines.
Replace worn or damaged belts to maintain proper function of engine systems driven by the belt.
Produced to meet Mercury Marine original equipment manufacturer specifications to maximize the performance of your MerCruiser sterndrive
Part Fitment Verification
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| Serial Number | Type | V‑Belt |
|---|---|---|
| 0L382121 And Below | 40" Main V‑Belt | 57‑69143Q |
| 0L382122 And Above | 39.5" Main V‑Belt | 57‑862054Q |
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