Mercury MerCruiser Quicksilver High Performance Oil Filter 858004K
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The Mercury MerCruiser Quicksilver High Performance Oil Filter 858004K is a genuine Mercury screw-on oil filter designed for MerCruiser sterndrive and inboard engines. It uses high-efficiency synthetic filtration media to remove more than 97% of oil contaminants, helping protect internal engine components and maintain cleaner lubrication during routine marine engine service.
Key Features
- Genuine Mercury Marine high-performance oil filter
- Part number: 858004K
- Also referenced as 35-858004K
- Screw-on canister-style oil filter
- High-efficiency synthetic filtration media removes more than 97% of oil contaminants
- Designed for MerCruiser sterndrive and inboard marine engine applications
- Easy replacement with common tools and an oil filter wrench
- GTIN / UPC: 745061526600
- Approximate shipping dimensions: 3.90" L x 3.90" W x 4.20" H
- Approximate shipping weight: 1.00 lb
Engine Compatibility
Designed for use on MerCruiser 4.5L and 6.2L sterndrive and inboard engines, plus GM-based MerCruiser sterndrive and inboard engines. Mercury notes this filter is not for V6 models with the oil filter mounted directly on the engine block.
Serial Number Fitment Notice
Oil filter fitment can vary by engine model, oil filter mounting location, production year, and serial number. Always confirm 858004K / 35-858004K 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 reduce abrasive contaminants in the lubrication system and supports reliable long-term engine protection.
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Alternate/Superseded Part Numbers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: 858004K
- Mercury / Quicksilver reference: 35-858004K
- Related Quicksilver-branded reference: 858004Q
- GTIN / UPC: 745061526600
Parts Desk Insight
This is the high-performance filter option for many GM-based MerCruiser applications, but the V6 block-mounted filter exception matters. The safest match is by engine serial number, original filter number, and filter mounting location rather than engine size alone.
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.