WIX Oil Filter 51083 – Mercury & Mariner Four-Stroke Outboards
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WIX Oil Filter 51083 – Mercury & Mariner Four-Stroke Outboards
The WIX 51083 is a full-flow spin-on lubricating oil filter used in select Mercury and Mariner four-stroke outboards, as well as compatible automotive and industrial engine applications. Its enhanced-cellulose filtration media captures damaging contaminants while maintaining the oil flow required to protect bearings, journals, and other internal engine components.
This filter measures approximately 3.40 inches high by 2.92 inches in diameter and uses an M20 × 1.5 mounting thread. It includes an anti-drainback valve and an 8–11 psi bypass valve to help maintain lubrication during startup and when the filter media becomes restricted.
Key Features
- Full-flow spin-on engine oil filter
- Enhanced-cellulose filtration media
- Nominal filtration rating: 21 microns
- Thread size: M20 × 1.5
- Height: approximately 3.40 in / 86 mm
- Outside diameter: approximately 2.92 in / 74 mm
- Gasket outside diameter: approximately 2.73 in / 69 mm
- Rated flow range: 9–11 GPM
- Bypass-valve setting: 8–11 psi
- Integrated anti-drainback valve
- Burst-pressure rating: 280 psi
- Attached sealing gasket
- WIX Part Number: 51083
- UPC/GTIN: 765809510838
Engine Compatibility
WIX catalogue data associates the 51083 with select Mercury Marine and Mariner mid-range four-stroke outboards, including Mercury 25 hp, 30 hp, 30 EFI, 40 hp, 40 EFI, 115 EFI, and corresponding select Mariner mid-range applications. The WIX catalogue also links this filter specification with Mercury 35-8M0162830 and MerCruiser 35-877767K01. Exact application can vary by model year, engine origin, serial-number range, and installed oil filter head.
Fitment Notice
Confirm the outboard model, serial number, and number printed on the existing filter before ordering. Mercury and Mariner engines with the same advertised horsepower may use different filters depending on production year, engine family, and manufacturing source. Do not select this filter by its M20 × 1.5 thread alone — filter height, gasket diameter, bypass pressure, and anti-drainback-valve configuration must also match the engine’s lubrication system.
When to Replace
Replace the oil filter whenever the engine oil is changed or at the interval specified in the engine owner’s or service manual. Earlier replacement may be appropriate following extended trolling or low-speed operation, frequent short operating cycles, heavy-load or high-temperature use, fuel, water or debris contamination, long periods of seasonal storage, internal engine repairs, or abnormal oil-pressure conditions. Replace the filter immediately if the housing is dented, heavily corroded, or leaking.
Installation Notes
Remove the old filter and verify its sealing gasket has not remained on the mounting surface. Clean the filter head and lightly lubricate the new gasket with clean engine oil. Install by hand to the manufacturer’s tightening specification — do not overtighten. After installation: refill with the specified oil, start the engine and confirm normal oil pressure, inspect for leakage, shut down and allow oil to settle, then recheck and correct the oil level.
Cross-Reference Numbers
- Mercury 35-8M0162830
- MerCruiser 35-877767K01
- NAPA Gold 1083
- Baldwin B7441 / B1402 / BT310
- Donaldson P550173
- Fleetguard LF3960
- FRAM PH9897
- Luber-finer PH2903
- Mann W610/81 / W712/8
- Suzuki 16510-86Z00
- Volvo 2900776 / 30866266
Cross-reference numbers are comparison aids only. Confirm the original filter number and exact engine application before substituting brands.
Other WIX Filters
- WIX Oil Filter 51806
- WIX Oil Filter 51365 – Honda Marine, Tohatsu & Yanmar
- WIX Oil Filter 51358 – Yanmar Marine Diesel
- WIX Oil Filter 51515 – Ford Marine
- WIX Oil Filter 51361 – Nissan, Infiniti & Kubota
- WIX Hydraulic Filter 51551 – 10 Micron
Parts Desk Insights
The common mistake with this filter is ordering by horsepower alone. Mercury used several different engine families across its mid-range lineup, so matching the serial number and existing filter number is the safest way to confirm the correct bypass and gasket specifications. The Mercury OEM cross-references (35-8M0162830 and 35-877767K01) are the most reliable confirmation of fitment for Mercury and Mariner applications.
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.