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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.

✓ Recommended for the Honda BF50
18-7911-1 — OIL FILTER

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✓ Fitment cross-referenced from OEM catalogs · ✓ Step-by-step video above · ✓ Fast Amazon shipping & easy returns — verify your model code before ordering

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

  1. Remove the drain plug located at the back of the motor using a 12mm wrench.
  2. Place an oil container or bucket underneath the drain plug.
  3. Use a juice bottle as a funnel to catch any overflow while draining the oil.
  4. Allow the oil to drain completely into the container.
  5. Wipe down the area around the drain hole with a rag.
  6. Check for any metal shards or debris in the drained oil; if present, clean them up.
  7. Inspect the washer on the drain plug and replace it if necessary.
  8. 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.

Ready to fix it?
Get the 18-7911-1 oil filter for your Honda BF50.

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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.