Yamaha F50 Oil & Filter Change
Fresh oil and a new filter are the cheapest insurance for your 50 hp Yamaha F50. Below is the oil filter we recommend, which F50 variants it 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 the oil filter on a Yamaha F50
Yamaha 50 hp 4 stroke, OIl & Filter change
Tools Needed
- 14 mm socket
- Channel locks
- Clean cloth
Safety
- Ensure the motor is tilted up to avoid oil spillage.
- Be cautious while using tools to avoid damaging the motor.
Steps
- Locate the drain plug at the bottom of the motor.
- Use a 14 mm socket to loosen the drain plug.
- Tilt the motor down to allow the oil to drain completely.
- Use channel locks to carefully remove the oil filter.
- Clean the base of the filter and the motor seat with a clean cloth.
- Place the new oil filter on the motor seat.
- Hand-tighten the oil filter until it stops turning.
- Use the 14 mm socket to give the filter a slight turn to crush the gasket.
- Fill the motor with the recommended oil until it reaches the dipstick level.
Tips
- It is easier to change the oil filter when the motor is warm, but avoid polluting the water if the boat is in the water.
- Use a thin oil for easier starting, especially in colder temperatures.
Which part do I need for my Yamaha F50?
For most F50 owners the part above (18-7902) 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 (8)
| Part number | Description | Fits | |
|---|---|---|---|
| 18-7911-1 | OIL FILTER | F50 | Find on Amazon → |
| 18-8700 | Oil Filter for Yamaha engines. | F50 | Find on Amazon → |
| 3FV-13440-00-00 | Oil filter | F50 | Find on Amazon → |
| 3FV-13440-20-00 | Oil filter | F50 | Find on Amazon → |
| 3R0-07615-0 | Oil filter | F50 | Find on Amazon → |
| 5GH-13440-20 | Oil filter | F50 | Find on Amazon → |
| 5JW-13400-00-00 | Oil filter | F50 | Find on Amazon → |
| 5GH-13440-50-00 | Oil filter | F50 | Find on Amazon → |
Many of these are the same physical part under different brand numbers. Build years are shown where our parts data has them. Where a variant has no years, only the model code is listed. Confirm against your engine plate before ordering.
Frequently asked questions
What oil filter fits a Yamaha F50 (50 hp)?
The Yamaha F50 uses the oil filter sold as Sierra 18-7902, plus its OEM and aftermarket cross-references (8 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 Yamaha F50?
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 Yamaha F50?
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 Yamaha F50?
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 Yamaha F50?
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
- Yamaha F25 oil filter
- Yamaha F225 oil filter
- Yamaha F250 oil filter
- Yamaha F60 oil filter
- All Yamaha maintenance guides
- Free Yamaha boat valuation
- Buying a boat? Check whether the asking price is fair
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.