Mercury MerCruiser Quicksilver High Performance Oil Filter 858004K
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Mercury MerCruiser Quicksilver High Performance Oil Filter — 858004K
| Part Number | 858004K | Mercury Catalog: 35-858004K |
| Brand | Mercury Marine / MerCruiser / Quicksilver |
| Official Product Type | High Performance Screw-On Engine Oil Filter |
| Filtration Media | High-efficiency synthetic — removes more than 97% of oil contaminants |
| Filter Style | Screw-on canister |
| System | Engine Lubrication |
| Dimensions (approx.) | 3.90" L × 3.90" W × 4.20" H | 99 × 99 × 107 mm |
| Weight (approx.) | 0.45 kg / 1.00 lb |
| GTIN / UPC | 745061526600 |
Compatible Applications
Mercury specifies 858004K for the following engines. Confirm against your engine serial number and the Mercury parts diagram before ordering.
- All MerCruiser 4.5L sterndrive and inboard engines
- All MerCruiser 6.2L sterndrive and inboard engines
- GM-based MerCruiser sterndrive engines (selected applications)
- GM-based MerCruiser inboard engines (selected applications)
Exclusion: Mercury specifically excludes MerCruiser V6 engines where the oil filter is mounted directly on the engine block. Those installations require a different filter. See the Mercury MerCruiser 16779 Remote Oil Filter Adaptor Gasket — 4.3L / 4.3LX V6 listing for related V6 reference.
Fitment Notice — Confirm Before Ordering
Oil filter fitment varies by engine model, filter mounting location, production generation, and serial number. Always verify 858004K / 35-858004K against:
- The original filter number from the engine
- The Mercury parts diagram for your specific engine and serial-number range
- The filter mounting location (remote-mount vs. block-mounted)
This is especially important on V6 applications — block-mounted V6 installations use a different filter configuration.
Cross-Reference / Alternate Part Numbers
- 858004K (primary)
- 35-858004K (Mercury catalog format)
- 858004Q (Quicksilver-branded reference)
- 35-858004Q (Quicksilver catalog format)
Service Interval
Replace the oil filter at every engine oil change and during scheduled seasonal maintenance. Mercury recommends changing engine oil and filter at the interval specified in the service manual for the exact engine model — typically every 100 hours or annually, whichever comes first. Always replace the filter any time it is damaged, corroded, leaking, or has been removed during an oil change.
Installation Notes
- Remove the old filter with an appropriate oil filter wrench and clean the mounting surface
- Lightly coat the new filter gasket with fresh engine oil before installation
- Spin the filter on by hand until the gasket contacts the mounting base, then tighten to the specification in the Mercury service manual
- Refill with the correct grade and quantity of engine oil
- Start the engine and inspect the filter area for leaks
- Shut the engine down, allow the oil to settle, and recheck the oil level
- Correct the oil level as required before returning to service
Related Parts
- Mercury MerCruiser Quicksilver Oil Filter 8M0116378
- Mercury MerCruiser Quicksilver Oil Filter 866340K01
- Quicksilver Oil Filter 8M0116378
- Mercury MerCruiser Remote Oil Filter Hose – 32-864924
- Mercury Quicksilver 8M0188440 Oil Filter Adapter Gasket – MerCruiser Remote Oil Filter Assembly
- Mercury MerCruiser 16779 Remote Oil Filter Adaptor Gasket — 4.3L / 4.3LX V6
- Quicksilver 4-Stroke Engine Oil – 4L | Part 8M0078634
- Sierra 18-7824-2 Marine Oil Filter – GM MerCruiser, Volvo Penta, OMC, Crusader & Indmar
Parts Desk Insights
This is the go-to filter for 4.5L and 6.2L MerCruiser owners who want genuine OEM filtration with the synthetic media upgrade. The 97%+ contaminant removal rating makes it a solid choice for engines running in demanding conditions or extended service intervals. The one fitment trap to watch is the MerCruiser V6 block-mounted filter exception — if the filter bolts directly onto the engine block on a V6, this is not the right part. The safest confirmation is always the original filter number pulled from the engine, compared against the Mercury parts diagram for that serial-number range.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.
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For return authorization, please contact our support team before shipping anything back.