Mercury MerCruiser Quicksilver Oil Filter 866340K01
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The Mercury MerCruiser Quicksilver Oil Filter 866340K01 is a genuine Mercury 4-stroke engine oil filter for select MerCruiser sterndrive and inboard engines. It is designed to provide efficient oil filtration, helping remove contaminants from the engine oil while maintaining proper oil flow and protection during routine marine engine service.
Key Features
- Genuine Mercury Marine oil filter
- Part number: 866340K01
- Also referenced as 35-866340K01
- Screw-on canister-style oil filter
- Superior M-Pleated cleansing filter media helps remove oil contaminants
- Easy replacement with common tools and an oil filter wrench
- Designed for marine sterndrive and inboard engine applications
- UPC: 745061696495
Engine Compatibility
Designed for use on MerCruiser 4.5L and 6.2L sterndrive and inboard engines, plus many GM-based MerCruiser sterndrive and inboard gasoline engines. Mercury notes this filter is not for V6 models with the oil filter mounted directly on the engine block.
Commonly referenced applications include many MCM / MIE GM gasoline engine setups, depending on exact model and serial range.
Serial Number Fitment Notice
Oil filter fitment can vary by engine model, oil filter mounting location, production year, and serial number. Always confirm 866340K01 / 35-866340K01 against your MerCruiser engine serial number, original filter, or Mercury parts diagram before ordering.
When This Part Needs Replacement
Replace the oil filter during scheduled oil changes, seasonal maintenance, winterization, or any time the filter is damaged, corroded, leaking, restricted, or overdue for service. A clean oil filter helps protect internal engine components from abrasive contaminants and supports long-term engine life.
Installation Notes
Lightly oil the new filter gasket before installation, spin the filter on until the gasket contacts the mounting base, then tighten according to the engine service manual. After installation, run the engine, inspect carefully for leaks, shut down, and recheck the oil level before returning the engine to service.
Alternate/Superseded Part Numbers
- Mercury: 866340K01
- Mercury / Quicksilver reference: 35-866340K01
- Related Quicksilver reference: 35-866340Q03
- UPC: 745061696495
Parts Desk Insight
This filter is best matched by engine serial number and filter mounting location, not just engine size. The V6 exception matters because some MerCruiser V6 engines use a different filter when the oil filter mounts directly on the engine block.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.