Description
SIERRA Mercury/Yamaha Small-Outboard Oil Filter – 18-7901 is a spin-on marine engine oil filter engineered for selected small Mercury/Mariner and Yamaha four-stroke outboards. Its corrosion-resistant canister and high-efficiency media are designed for the humid, salt-laden conditions found around marine engines.
The filter uses a heavy-wall steel shell with protective epoxy coating and an anti-drain-back valve where specified by Sierra. Always match the engine model and OEM filter number because several filters in this size range use similar threads but different bypass, sealing and internal-media specifications.
Key Features
- Marine-grade heavy-wall steel canister
- Epoxy-coated exterior for corrosion resistance
- High-efficiency filter media designed to meet or exceed OE filtration
- Anti-drain-back valve for retained oil where specified
- Direct interchange for the listed OEM engine-filter numbers
Specifications
- Product type: Spin-on marine oil filter
- Thread: application-specific spin-on thread; verify by OEM number
- Application: selected small Mercury/Mariner and Yamaha four-stroke outboards
- Construction: epoxy-coated steel canister
- Service: replace at the engine manufacturer’s recommended interval
Interchange
- Yamaha: 6G8-13440-00-00
- Mercury/Mariner: 825467T1, 825467A1, 825467T02

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