Sierra 8700 4-Cycle Outboard Oil Filter – SKU 47-8700

A purpose-built oil filter for 4-cycle outboard engines, engineered to OEM specifications for correct thread fitment, bypass valve pressure, and flow rate. The Sierra 8700 is a direct-fit replacement designed to maintain proper oil pressure and filtration efficiency through your outboard's full service interval — protecting bearings, pistons, and internal surfaces from wear and contamination.

Compatibility note: Outboard oil filter fitment is engine-specific. Confirm the 8700 is correct for your outboard using Sierra's current application guide or your engine's service manual before ordering. Thread pitch, bypass valve pressure, and anti-drainback valve design all vary by engine family — an incorrect filter can cause inadequate oil pressure or premature bypass.

Compatible Applications

• 4-cycle outboard engines specifying the Sierra 8700 / part number 47-8700
• Confirm fitment against your engine make, model, year, and serial number range using Sierra's application guide
• Not a universal oil filter — verify before ordering if you are unsure of your engine's correct filter part number

Part Information

• Part number: 8700
• SKU: 47-8700
• Brand: Sierra International
• Filter type: Spin-on oil filter
• Application: 4-cycle outboard engines
• Fitment standard: OEM-specification thread, bypass valve pressure, and anti-drainback design
• Installation: Direct-fit replacement — no modifications required
• Condition: New

Service Interval

• Replace at every oil change — do not reuse a spin-on oil filter
• Typical outboard oil change interval: every 100 hours of operation or once per season, whichever comes first
• Always replace the oil filter when changing the engine oil — draining oil without replacing the filter leaves contaminated oil in the filter media that immediately mixes with fresh oil
• Consult your engine's service manual for the manufacturer's specified interval for your model

Technical FAQ

Q: Can I use a generic automotive oil filter instead?
No. Outboard engines operate in a marine environment with specific oil pressure ranges and thermal cycles that differ from automotive applications. Automotive filters may have incorrect bypass valve pressures, thread pitches, or anti-drainback designs that can cause oil starvation or contamination on startup.

Q: How do I confirm this filter fits my engine?
Cross-reference the 8700 part number against Sierra's application guide (available through your dealer or Sierra's website) using your engine make, model, year, and serial number. Your engine's service manual will also list the correct OEM filter part number, which you can cross-reference to 47-8700.

Q: Does the filter come with a new sealing gasket?
Yes — spin-on oil filters include an integrated rubber gasket on the filter base. Always ensure the old gasket is fully removed from the engine before installing the new filter. A double-gasketed filter will not seal correctly and will leak under pressure.

Q: How tight should I install the filter?
Hand-tight plus 3/4 turn is the standard specification for spin-on oil filters. Do not use a filter wrench to tighten — overtightening distorts the gasket and makes the filter extremely difficult to remove at the next service. The rubber gasket creates the seal, not torque.

Complete the Service — Related Products

• Sierra 9231 Complete Oil Change Kit – 4-Stroke Outboard — filter + drain plug gasket + oil in one kit
• Sierra 94203 10W-30 FCW 4-Stroke Outboard Oil – 1 Gal — outboard-specific 4-stroke engine oil

Other Sierra 4-Cycle Outboard Oil Filters

• Sierra 7896 4-Cycle Outboard Oil Filter
• Sierra 7897 4-Cycle Outboard Oil Filter
• Sierra 7901 4-Cycle Outboard Oil Filter
• Sierra 7902 4-Cycle Outboard Oil Filter
• Sierra 7903 4-Cycle Outboard Oil Filter
• Sierra 7909 4-Cycle Outboard Oil Filter
• Sierra 7913 4-Cycle Outboard Oil Filter
• Sierra 7914 4-Cycle Outboard Oil Filter
• Sierra 7916 4-Cycle Outboard Oil Filter
• Sierra 7918 4-Cycle Outboard Oil Filter
• Sierra 79062 4-Cycle Outboard Oil Filter
• Sierra 79111 4-Cycle Outboard Oil Filter
• Sierra 79151 4-Cycle Outboard Oil Filter
• Sierra 8870 4-Cycle Outboard Oil Filter
• Sierra 57824 Marine Oil Filter
• Sierra 78242 Oil Filter – GM/Chev Short

Parts Desk Insights

The 8700 is one of the most commonly ordered Sierra outboard oil filters, which also means it's one of the most commonly ordered incorrectly. Oil filter fitment on 4-cycle outboards is not interchangeable across brands or even across models within the same brand — thread pitch, bypass valve pressure, and anti-drainback valve design are all engine-specific. The right move before ordering any outboard oil filter is to look up your engine make, model, year, and serial number range in Sierra's application guide. If you already have the OEM filter on the engine, the part number is usually stamped on the filter body — cross-reference that to the Sierra catalog number to confirm. The best use case for this filter is a straightforward like-for-like replacement during a scheduled oil change on a compatible engine. Pair it with the Sierra 9231 Oil Change Kit if you want the drain plug gasket and oil included in a single order — it's the cleaner option for seasonal maintenance. Do not reuse spin-on filters between oil changes; the filter media cannot be cleaned and reuse risks contaminating fresh oil immediately.