Seachoice 21023 Full-Flow Oil Filter – Chrysler, MerCruiser, OMC & Volvo Penta | 50-21023

Seachoice 21023 Full-Flow Oil Filter

Part Number: 21023  |  SKU: 50-21023
Brand: Seachoice
Product Type: Full-Flow Spin-On Marine Oil Filter
Filtration Rating: 20 Micron
System: Engine Lubrication – Chrysler/Ford/Volvo Filter Family
UPC: 719249210230

Overview

The Seachoice 21023 is a 20-micron full-flow spin-on marine oil filter for compatible Chrysler, MerCruiser, OMC, and Volvo Penta inboard and sterndrive engines. A direct replacement for Sierra 18-7878-1, it belongs to the short-style Ford/Chrysler/Volvo marine filter family and also covers selected Albin and Onan marine generator applications. Built with high-efficiency cellulose media, an anti-drain-back valve, epoxy-coated corrosion-resistant canister, reinforced body, and heavy-duty end-cap seals — manufactured in an ISO/TS 16949 certified facility to meet or exceed OEM filtration performance.

Specifications

• Part Number: 21023 (SKU: 50-21023)
• Filter Style: Full-flow spin-on, short Chrysler/Ford/Volvo style
• Filtration Rating: 20 micron
• Filter Media: High-efficiency cellulose
• Anti-Drain-Back Valve: Yes
• Canister: Epoxy-coated, reinforced heavy-wall steel
• End-Cap Seals: Heavy-duty
• Manufacturing Standard: ISO/TS 16949 certified facility
• Weight: Approx. 467 g (1.03 lb)
• System: Engine lubrication
• UPC: 719249210230

Compatible Applications

• Chrysler marine inboard engines where OEM filter 3549957, L-19, or L-1008 is specified
• MerCruiser sterndrive engines (Ford-based) where filter 35-803470, 35-803470Q, 38463, or 46692 is specified
• OMC sterndrive engines where filter 0174796 or 502904 is specified
• Volvo Penta gasoline and diesel engines where filter 1266286, 2366286, 3517857, or 430143 is specified
• Albin marine applications where filter 3875827 is specified
• Onan marine generator applications where filter 122-0185 is specified
• Any application where Sierra 18-7878-1 is the specified replacement filter

Fitment Notice: This filter belongs to the short-style Chrysler/Ford/Volvo marine filter family. Confirm the existing OEM filter number and engine application before ordering — Chrysler, MerCruiser (Ford-based), OMC, and Volvo Penta engines can use different filter styles and thread specs depending on engine family and year. Matching by OEM number is more reliable than matching by appearance alone.

Cross-Reference Part Numbers

Seachoice 21023 replaces the following part numbers (verify by engine model and serial number):

• Sierra: 18-7878-1
• MerCruiser: 35-803470, 35-803470Q, 38463, 46692
• OMC: 0174796, 502904
• Volvo Penta: 1266286 / 1266286-2, 2366286, 3517857 / 3517857-3, 430143 / 430143-8
• Chrysler: 3549957, L-19, L-1008
• Albin: 3875827
• Onan: 122-0185

Service Interval

Replace at the engine manufacturer’s specified oil-service interval — typically every 100 hours of operation or once per season, whichever comes first. Regular filter replacement prevents accumulated contaminants from circulating through engine bearings and lubricated components. Always follow your engine manufacturer’s maintenance schedule.

Installation

1. Run the engine briefly to warm the oil, then shut it down per the service procedure.
2. Remove the old filter and confirm the sealing gasket came away with it — do not leave the old gasket on the mounting surface.
3. Clean the filter mounting surface.
4. Lightly coat the new filter gasket with clean engine oil.
5. Spin the filter on by hand and tighten per the engine manufacturer’s specification — do not over-tighten.
6. Start the engine, check oil pressure, inspect for leaks, and recheck oil level after shutdown.

Related Products

• Sierra 18-7878-1 – Oil Filter (Ford/Chrysler/Volvo Short)
• Volvo Penta Oil Filter 3517857 – OEM (AQ, BB, AD31, TAMD31, KAD32)
• Seachoice 21001 – Full-Flow Oil Filter (GM MerCruiser, Volvo Penta, OMC)
• Seachoice 21003 – Full-Flow Oil Filter (Honda, Yamaha & Nissan/Tohatsu)
• Seachoice 21004 – Full-Flow Oil Filter (Mercury & MerCruiser)

Parts Desk Insights

Best Use Case: The Seachoice 21023 is the right filter for routine oil changes on Chrysler inboard, Ford-based MerCruiser sterndrive, OMC, and Volvo Penta engines — it covers the short-style Chrysler/Ford/Volvo marine filter family across several major brands. If Sierra 18-7878-1 or any of the listed OEM numbers is what your engine currently uses, the 21023 is the correct replacement.

Common Questions: The most important fitment check is making sure this is the correct filter style for your engine. Chrysler, Ford-based MerCruiser, and Volvo Penta engines can use different thread specifications and filter lengths depending on the engine year and model. Always match by the OEM part number on the filter being removed, not by physical size alone. If you’re unsure, contact us with your engine make, model, and serial number.