Honda BF50 Oil & Filter Change
Fresh oil and a new filter are the cheapest insurance for your 50 hp Honda BF50. Below is the exact oil filter that fits, a step-by-step video of the full oil change, and what else you need for the job.
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Watch: how to do it (step by step)
How to Replace Oil Filter – honda 50HP
Oil Change Honda 40/50hp Outboard
Tools Needed
- Large flat-head screwdriver
- 12mm wrench
- Rag
- Oil container or bucket
- Cup
- Needle-nose pliers (optional)
Safety
- Wear gloves to avoid getting oil on your hands.
- Be careful when handling the oil filter and oil pan.
Steps
- Remove the drain plug located at the back of the motor using a 12mm wrench.
- Place an oil container or bucket underneath the drain plug.
- Use a juice bottle as a funnel to catch any overflow while draining the oil.
- Allow the oil to drain completely into the container.
- Wipe down the area around the drain hole with a rag.
- Check for any metal shards or debris in the drained oil; if present, clean them up.
- Inspect the washer on the drain plug and replace it if necessary.
- Reinsert the drain plug and tighten it using a 12mm wrench.
Tips
- Use an oil diaper to help absorb any overflow during the draining process.
- Ensure that you use metric tools as Honda motors are all metric.
- When installing the new oil filter, apply some oil or fogging fluid on the backside of the gasket for better sealing.
Which part do I need for my Honda BF50?
For most BF50 owners the part above (18-7911-1) is the right choice. Price tip: the aftermarket numbers are usually noticeably cheaper than the OEM-branded box — it is the same physical part. If you need an exact match, these compatible part numbers also fit:
Show all compatible part numbers (7)
| Part number | Description | |
|---|---|---|
| 18-7913 | OIL FILTER | Find on Amazon → |
| 35-822626Q04 | Oil filter | Find on Amazon → |
| 35-822626Q1 | Mercury OEM 35-822626Q1 (replaces Sierra 18-7913) | Find on Amazon → |
| 35-822626Q2 | Oil filter | Find on Amazon → |
| 3R0-07615-0 | Oil filter | Find on Amazon → |
| K03 | Mercury OEM K03 (replaces Sierra 18-7913) | Find on Amazon → |
| Q3 | Mercury OEM Q3 (replaces Sierra 18-7913) | Find on Amazon → |
Many of these are the same physical part under different brand numbers. Confirm against your engine plate before ordering.
Frequently asked questions
What oil filter fits a Honda BF50 (50 hp)?
The Honda BF50 uses the oil filter sold as 18-7911-1, plus its OEM and aftermarket cross-references (7 compatible numbers are listed above). Confirm the number against your engine's model code and year plate before ordering.
How often should I replace the oil filter on a Honda BF50?
Change the oil and filter every 100 running hours or once a season, whichever comes first (check your manual for the exact interval).
What else do I need for an oil change on a Honda BF50?
The correct grade and amount of engine oil (see the manual or the video), a new drain-plug washer, a filter wrench and a drain pan or oil extractor pump. Nothing exotic — it is standard service equipment.
What are the signs the oil is overdue on a Honda BF50?
Dark, gritty oil well past its interval, low-pressure warnings — and milky or grey oil, which means water is getting in and should be investigated immediately.
How long does an oil change take on a Honda BF50?
About an hour for a competent DIYer. Run the engine warm first — warm oil drains faster and carries more contaminants out with it.
Related guides
- Honda BF40 oil filter
- Honda BF150 oil filter
- Honda BF200 oil filter
- Honda BF90 oil filter
- All Honda maintenance guides
- Free Honda boat valuation
As an Amazon Associate we earn from qualifying purchases — at no extra cost to you. Prices and availability are shown at checkout. This guide is for reference; always follow the engine manufacturer’s service manual.