Mallory 9-57825 Marine Oil Filter – GM MerCruiser, Crusader & OMC
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Mallory 9-57825 Marine Oil Filter – GM MerCruiser, Crusader & OMC
The Mallory Marine 9-57825 is a short-format, full-flow spin-on oil filter for select GM-based sterndrive and inboard marine engines. It is commonly associated with GM 3.0L four-cylinder engines, numerous GM V8 applications, and V6 engines equipped with a remote oil-filter system.
Mallory 9-57825 cross-references to the current Quicksilver 35-866340Q03 and Sierra 18-7824-2 marine oil filters. These replacements are engineered for marine service with corrosion-resistant construction, high-efficiency filtration media, and an anti-drainback valve that helps retain oil for faster lubrication during startup.
Key Features
- Short-format marine spin-on oil filter
- Full-flow engine lubrication service
- Designed for select GM-based marine engines
- Common 13/16"-16 mounting thread
- Suitable for installations with restricted filter clearance
- Anti-drainback valve on current replacement equivalents
- Marine-grade corrosion-resistant construction
- Cross-references to current Mercury, Quicksilver, and Sierra filters
- Legacy Mallory part number: 9-57825
Engine Compatibility
Common applications include select:
- MerCruiser 3.0L GM181 inline four-cylinder engines
- MerCruiser 5.0L GM305 V8 engines
- MerCruiser 5.7L GM350 V8 engines
- MerCruiser 6.2L GM377 engines
- MerCruiser 7.4L GM454 V8 engines
- MerCruiser 8.1L GM496 engines
- MerCruiser 8.2L GM502 engines
- MerCruiser V6 engines equipped with a remote oil-filter mount
- Mercury Marine-manufactured 4.5L and 6.2L engines
- Select Crusader, Indmar, PCM, OMC, and Volvo Penta GM-based marine engines
The equivalent Quicksilver filter is specified for MerCruiser sterndrive and inboard engines except V6 models with the filter mounted directly on the engine block.
Fitment Notice
Confirm the engine model, serial number, filter location, and number printed on the existing filter before ordering. This filter is commonly used on GM V6 engines only when a remote oil-filter system is installed — V6 engines with the filter mounted directly to the engine block generally require a different filter. Filter requirements can also vary by engine year, marinizer, and remote-filter configuration. Do not select the filter by its 13/16"-16 thread alone — the gasket diameter, body length, internal valve arrangement, and available installation clearance must also match.
When to Replace
Replace the oil filter whenever the engine oil is changed or at the service interval specified in the marine engine owner’s manual. Earlier replacement may be appropriate following extended trolling or low-speed operation, heavy-load or high-temperature use, fuel, water or coolant contamination, long periods of seasonal storage, internal engine repairs, abnormal oil-pressure conditions, or visible corrosion, denting, or leakage.
Installation Notes
Remove the old filter and confirm its sealing gasket has not remained on the filter head. Clean the sealing surface and compare the replacement filter’s thread, gasket, and body length with the removed filter. Lightly coat the new gasket with clean engine oil and install by hand to the manufacturer’s tightening specification — do not overtighten. After installation: refill with the specified oil, start the engine and verify normal oil pressure, inspect for leakage, shut down and allow oil to settle, then recheck and correct the oil level.
Cross-Reference Numbers
- Mallory 9-57825 / 9-57801
- Sierra 18-7824-2
- WIX 51086
- Baldwin B27
- Quicksilver 35-866340Q03 / 35-866340Q02 / 35-802885Q
- Mercury 35-866340K01 / 35-802885T
- Mercury MerCruiser 14957 / 32716 / 32717 / 52022 / 52731 / 52731A1 / 54111
- OMC 173232 / 502902 / 778864
- Crusader 201104
- Indmar 50-1001 / 872023
- Pleasurecraft R077002
- Volvo Penta 3852030 / 3852412 / 835440
Sierra officially lists 18-7824-2 as a replacement for Mallory 9-57825 and the related Mercury, Quicksilver, OMC, Crusader, Indmar, Pleasurecraft, and Volvo Penta numbers. Cross-reference numbers are comparison aids only — confirm the original application before substituting brands.
Other Marine Oil Filters
- WIX Oil Filter 51061 – GM Tall Marine (MerCruiser, OMC, Crusader)
- WIX Oil Filter 51083 – Mercury & Mariner Outboards
- WIX Oil Filter 51515 – Ford Marine
- WIX Oil Filter 51806
Parts Desk Insights
The important distinction is not simply “GM engine.” This short filter works across many GM four-cylinder and V8 marine applications, but GM V6 engines generally require it only when equipped with a remote filter mount — checking the existing filter location is usually the quickest way to avoid the wrong replacement. The extensive MerCruiser, OMC, Crusader, Indmar, and Volvo Penta cross-references above make this one of the most broadly applicable GM marine oil filters in the catalog.
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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.