Yamaha F9 Oil & Filter Change
Fresh oil and a new filter are the cheapest insurance for your 9 hp Yamaha F9. Below is the oil filter we recommend, which F9 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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Which part do I need for my Yamaha F9?
For most F9 owners the part above (18-7901) 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 (3)
| Part number | Description | Fits | |
|---|---|---|---|
| 18-7911-1 | OIL FILTER | F9.9 (2007–2019) | Find on Amazon → |
| 3R0-07615-0 | Oil filter | F9.9 (2007–2019) | Find on Amazon → |
| 825467T02 | Mercury OEM 825467T02 (replaces Sierra 18-7901) | F9.9 (2007–2019) | 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 F9 (9 hp)?
The Yamaha F9 uses the oil filter sold as Sierra 18-7901, plus its OEM and aftermarket cross-references (3 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 F9?
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 F9?
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 F9?
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 F9?
About an hour for a competent DIYer. Run the engine warm first — warm oil drains faster and carries more contaminants out with it.
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