Seachoice 50-21007 Full-Flow Oil Filter – 20 Micron | Mercury, OMC & Chrysler Marine
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Seachoice 50-21007 Full-Flow Marine Oil Filter – 20 Micron
Part Number: 50-21007 | Brand: Seachoice | UPC: 719249210070
A 20-micron full-flow spin-on oil filter for selected Mercury/MerCruiser, OMC, and Chrysler Marine inboard and sterndrive engines. High-efficiency cellulose media traps contaminants before they reach bearings and lubricated engine components, while the epoxy-coated canister holds up in salt air and bilge environments.
Features
- 20-micron full-flow filtration — high-efficiency cellulose media
- Anti-drain-back valve maintains oil pressure between starts
- Epoxy-coated canister for corrosion resistance
- Reinforced canister construction and heavy-duty end-cap seals
- Manufactured in an ISO/TS 16949 certified facility
Compatible Applications
- Mercury / MerCruiser inboard and sterndrive engines — replaces 35-883702K / 35-883702Q
- OMC inboard engines — replaces 0502903
- Chrysler Marine engines — replaces L319
Confirm the engine model and existing oil filter number before ordering. The strongest fitment identifiers are Sierra 18-7879-1, Mercury 35-883702K / 35-883702Q, OMC 0502903, or Chrysler L319.
Service Interval
Replace at the engine manufacturer’s recommended oil-service interval. Regular filter replacement prevents accumulated contaminants from circulating through bearings and other lubricated engine components.
Installation Notes
Remove the old filter and confirm its sealing gasket comes away with it. Clean the mounting surface, lightly coat the replacement gasket with fresh engine oil, install hand-tight plus per the engine manufacturer’s procedure, and check for leaks after first startup.
Cross-Reference Part Numbers
- Seachoice: 50-21007 / 21007
- Sierra: 18-7879-1
- Mercury: 35-883702K
- Mercury / Quicksilver: 35-883702Q
- OMC: 0502903
- Chrysler: L319
- Wix: 51036
- Fram: PH3980
Parts Desk Insights
This is one of the more widely applicable filters in the Seachoice lineup — best suited for routine oil changes on Mercury inboard and sterndrive engines, OMC inboards, and older Chrysler marine engines. The Wix 51036 and Fram PH3980 cross-references confirm it’s a high-volume filter size commonly stocked for shops servicing mixed older inboard fleets. The most common issue is customers confusing this filter with other Seachoice marine oil filter sizes — the quickest way to confirm is by matching Sierra 18-7879-1, Wix 51036, or Fram PH3980.
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.
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.