Volvo Penta Oil Filter 21549544

Part Details

• Part Number: 21549544
• Brand: Volvo Penta
• Official Product Type: Engine Oil Filter Spin-On
• Supersedes: 3581621 861475 861475-2
• Replaced By: 21549544 is the current active part number
• Engine Family: Volvo Penta MD2020, MD2030, MD2040 marine diesel
• System: Engine lubrication removes wear particles and contaminants from engine oil before circulation through bearings and internal components
• Kit Contents: One spin-on oil filter with integrated sealing gasket

Compatible Applications

Fitment is engine-model and serial-number specific. Confirm 21549544 against your engine serial number and the Volvo Penta lubrication diagram before ordering.

• MD2020
• MD2020A
• MD2020B
• MD2020C
• MD2020D
• MD2030
• MD2030A
• MD2030B
• MD2030C
• MD2030D
• MD2040
• MD2040A
• MD2040B
• MD2040C
• MD2040D
• Additional legacy applications where the engine parts diagram specifies 861475, 3581621, or 21549544

Serial Number Fitment Notice

Volvo Penta used different filters across similar-looking diesel engine families. Physical appearance alone is not a reliable fitment check. Always confirm the filter reference against the engine serial number, original filter part number, or the Volvo Penta parts diagram before ordering.

Superseded Part Numbers

• 21549544 current Volvo Penta number
• 3581621 previous Volvo Penta number
• 861475 earlier Volvo Penta number
• 861475-2 hyphenated catalog reference

Cross-References

• Mann W 719/12
• Related Volvo references: 861474 3580228 3580454

Service Interval

Replace the oil filter at every scheduled oil change, whenever contaminated oil is drained, or after any internal engine work. Follow the Volvo Penta maintenance schedule for the specific engine model. A restricted or overdue filter can reduce oil flow, increase differential pressure, and accelerate engine wear.

When This Part Needs Replacement

Replace the oil filter when any of the following apply:

• Scheduled oil-change interval reached
• Contaminated or degraded oil drained
• Filter body corroded, damaged, or leaking
• Internal engine work completed
• Seasonal service, winterization, or recommissioning

Installation Notes

Drain or extract the engine oil according to the Volvo Penta service procedure. Remove the old filter and confirm its sealing gasket did not remain on the filter head a double gasket will cause an oil leak. Lightly lubricate the new gasket with clean engine oil, install hand-tight then tighten as specified in the service manual, refill with the correct oil grade and quantity, and check carefully for leaks after starting. Never reuse the old gasket.

Related Parts

• Oil Drain Plug
• Engine Oil
• 861474 related filter reference

Parts Desk Insight

If the engine records or old filter show 861475 or 3581621, order using the current 21549544 number they are the same filter through the supersession chain. Before installing, compare the new filters gasket diameter, mounting thread, and overall length against the removed filter, especially on repowered or previously modified vessels where a non-original filter may have been fitted. The gasket check after removing the old filter is the step most often skipped a stuck old gasket on the filter head is a reliable source of post-service oil leaks.