Sierra 18-7903 4-Cycle Outboard Oil Filter – Suzuki DF9.9/DF15 & Johnson/Evinrude
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Sierra 18-7903 4-Cycle Outboard Oil Filter – Suzuki DF9.9/DF15 & Johnson/Evinrude
Part Number: 18-7903 | SKU: 47-7903 | UPC: 808282244880
The Sierra 18-7903 is a marine spin-on oil filter for selected Suzuki DF-series and Johnson/Evinrude 4-stroke outboard engines, primarily in the smaller DF9.9 and DF15 range. It uses a heavy-wall steel canister with epoxy corrosion protection and high-efficiency filter media that meets or exceeds OEM filtration requirements.
Key Specifications
- Filter type: 4-cycle outboard spin-on oil filter
- Canister: Heavy-wall epoxy-coated steel
- Filter media: High-efficiency, meets or exceeds OEM specification
- Marine-duty construction for freshwater and saltwater environments
Compatible Applications
- Suzuki DF9.9 4-stroke outboards specifying Suzuki 16510-05240
- Suzuki DF15 4-stroke outboards specifying Suzuki 16510-05240
- Johnson 4-stroke outboard applications specifying J/E 5033102 or 763364
- Evinrude 4-stroke outboard applications specifying J/E 5033102 or 763364
Fitment Note: Confirm your engine model, horsepower, model year, and existing filter part number before ordering. The strongest fitment check is matching Suzuki 16510-05240 or Johnson/Evinrude 5033102 / 763364 to the filter currently on your engine.
Service Interval
Replace at every scheduled engine oil service. Follow the outboard manufacturer’s recommended interval for your specific engine model — typically every 100 hours or once per season, whichever comes first.
Installation Notes
- Remove the old filter and confirm the old gasket has come away with it — a retained gasket will cause an oil leak
- Clean the filter mounting surface
- Lightly coat the new filter gasket with fresh engine oil before threading it on
- Tighten by hand plus ¾ turn, or per engine manufacturer specification — do not over-tighten
- Run the engine and inspect for leaks before returning to service
OEM & Cross-Reference Part Numbers
- Sierra: 18-7903
- Suzuki: 16510-05240
- Johnson / Evinrude: 5033102, 763364
- Mallory: 9-57807
- EMP: 35-57807
Related Products
- Seachoice 50-21017 Full-Flow Oil Filter – 20 Micron — value alternative for Suzuki & OMC outboard applications
- Sierra 18-7896 4-Cycle Outboard Oil Filter – Suzuki DF-Series & Johnson/Evinrude — Sierra filter for larger Suzuki DF-series outboards
- Sierra 18-7897 4-Cycle Outboard Oil Filter – Suzuki DF115/DF140 & Johnson/Evinrude
- Sierra 18-7902 4-Cycle Outboard Oil Filter – Yamaha F15–F100 4-Stroke
Parts Desk Insights
Best Use Case: Routine oil and filter changes on Suzuki DF9.9 and DF15 4-stroke outboards and compatible Johnson/Evinrude 4-stroke applications. The DF9.9 and DF15 are popular small 4-stroke outboards widely used for dinghy tenders, canoes, inflatables, and small aluminum boats — making this a frequently requested maintenance item for shops servicing entry-level Suzuki 4-stroke outboards.
Common Issues: Suzuki uses multiple oil filter references across their DF-series lineup, and several look similar. The most reliable fitment confirmation is matching Suzuki 16510-05240 or Johnson/Evinrude 5033102 / 763364 against the filter currently on the engine. If a customer is unsure, ask for the engine model and year. As with all spin-on filters, remind customers to confirm the old gasket comes off with the old filter before installing the new one.
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
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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.
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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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