Yamaha F25 Oil & Filter Change
Fresh oil and a new filter are the cheapest insurance for your 25 hp Yamaha F25. Below is the oil filter we recommend, which F25 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 F25
How to Do an Oil Change for a Yamaha 25hp 4 stroke boat motor
Tools Needed
- Oil filter wrench
- Oil drain pan
- Funnel
- New oil filter
- New spark plugs
Safety
- Ensure the engine is cool before starting the oil change.
- Be cautious when handling hot oil.
Steps
- Remove the old oil filter by turning it counterclockwise (left).
- Place the old oil filter in the oil drain pan to prevent spills.
- Install the new oil filter by hand, turning it clockwise (right).
- Tighten the new oil filter using the oil filter wrench.
- Pour the new oil into the funnel and slowly pour it into the engine.
- Check the oil level using the dipstick to ensure it is at the correct level.
- Remove the spark plug caps.
- Loosen the spark plugs using a wrench.
- Remove the old spark plugs.
- Install the new spark plugs by hand, ensuring they are properly seated.
- Tighten the new spark plugs using a wrench.
- Replace the spark plug caps.
Tips
- Use the "righty tighty, lefty loosey" rule for tightening and loosening parts.
- Be careful when pouring oil to avoid spills.
Which part do I need for my Yamaha F25?
For most F25 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 | F25 | Find on Amazon → |
| 18-8700 | Oil Filter for Yamaha engines. | F25 | Find on Amazon → |
| 3FV-13440-00-00 | Oil filter | F25 | Find on Amazon → |
| 3FV-13440-20-00 | Oil filter | F25 | Find on Amazon → |
| 3R0-07615-0 | Oil filter | F25 | Find on Amazon → |
| 5GH-13440-20 | Oil filter | F25 | Find on Amazon → |
| 5JW-13400-00-00 | Oil filter | F25 | Find on Amazon → |
| 5GH-13440-50-00 | Oil filter | F25 | 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 F25 (25 hp)?
The Yamaha F25 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 F25?
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 F25?
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 F25?
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 F25?
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 F50 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.