MERCURY 866340K01 Oil Filter for MerCruiser 4.5L & 6.2L Sterndrive/Inboard — 4-Stroke Pleated Media

MERCURY 866340K01 is a 4-stroke oil filter engineered to trap contaminants and protect MerCruiser sterndrive and inboard engines by delivering reliable filtration and straightforward replacement.

This engine oil filter is built for marine 4.5L and 6.2L MerCruiser sterndrive and inboard engines, and for compatible GM engines where the filter is not block-mounted. Designed to match Mercury parts standards, the 866340K01 uses pleated filtration media to capture particles while maintaining oil flow, and it installs with standard tools making routine service quicker on the dock or in the garage.

Which engines and models is the 866340K01 compatible with?

The MERCURY 866340K01 fits MerCruiser 4.5L and 6.2L sterndrive and inboard engines, and many GM-based marine engines, provided the oil filter is not mounted directly on the engine block. Always verify fitment against your engine serial number or OEM parts diagram before purchase.

• Fits MerCruiser 4.5L and 6.2L sterndrive and inboard engines
• Compatible with certain GM marine engines with non-block-mounted filters
• Not for V6 engines that have the oil filter mounted on the block
• Check engine serial or parts catalog for exact compatibility

How does this filter affect routine maintenance and service time?

The 866340K01 is designed for simple replacement with common tools, which helps reduce service time during oil change intervals. Its standard housing size and filter nut location let technicians and boat owners remove and replace the unit quickly, lowering the time your craft is out of service.

• Standard sizing for quick removal with an oil filter wrench
• Pleated media minimizes clogging while preserving oil flow
• Replacement steps similar to other spin-on marine filters
• Reduces downtime during scheduled maintenance

What filtration performance can I expect from the MERCURY 866340K01?

The filter uses pleated cleansing media to capture a wide range of contaminants from engine oil while allowing consistent flow for lubrication. It’s engineered to meet Mercury’s quality standards for fit and function, offering predictable performance across normal operating conditions.

• M-pleated media captures common oil-borne contaminants
• Balanced design maintains oil flow at typical engine RPMs
• Manufactured and tested to match Mercury fit and form expectations
• Suitable for standard OEM service intervals when used with correct oil

Are there any installation tips or precautions I should know?

Install the filter with clean hands and tools, lubricate the gasket lightly with fresh oil, and torque according to the engine manufacturer’s recommendation to avoid leaks. Inspect the seal surface on the filter mount before fitting and replace the filter at recommended intervals or if you notice contamination or performance changes.

• Lubricate gasket with engine oil for proper sealing
• Tighten to manufacturer-specified torque or hand-plus-quarter-turn if unspecified
• Check mounting surface for debris or old gasket material
• Dispose of used oil and filter according to local regulations

Who is this for: The MERCURY 866340K01 oil filter is aimed at boat owners, mechanics, and marinas servicing MerCruiser 4.5L and 6.2L sterndrive and inboard engines or compatible GM-based marine engines. It’s a good choice when you want a factory-quality, easy-to-install replacement part that follows Mercury’s engineering and fitment standards for routine maintenance and reliable operation.