Suzuki DF40 Oil & Filter Change
Fresh oil and a new filter are the cheapest insurance for your 40 hp Suzuki DF40. Below is the oil filter we recommend, which DF40 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 Suzuki DF40
How To Change the Engine Oil in a DF40A/DF50A/DF60A
Tools Needed
- Oil drain pan
- New engine oil drain plug gasket
- New oil filter
- Xtar Suzuki marine engine oil
- Funnel
Safety
- Ensure the motor is positioned vertically to avoid oil spills.
- Allow the engine oil to drain completely to prevent burns.
Steps
- Position the motor vertically.
- Remove the motor cover.
- Remove the oil filler cap.
- Place an oil drain pan underneath the motor.
- Remove the engine oil drain plug and gasket.
- Allow the engine oil to drain completely.
- Secure the engine oil drain plug with a new gasket.
- If changing the oil filter, loosen the old filter by turning it counterclockwise.
- Remove the old oil filter.
- Rub a little oil on the O-ring of the new filter.
- Install the new oil filter.
- Using a funnel, add the recommended amount of Xtar Suzuki marine engine oil.
- Check the oil level.
- Wait 2 minutes and check the oil level again.
- Resecure the oil filler cap.
Tips
- Make sure to have all the necessary tools and materials on hand before starting.
- Use a funnel to prevent spilling when adding new oil.
Which part do I need for my Suzuki DF40?
For most DF40 owners the part above (18-7915-1) 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 (3)
| Part number | Description | Fits | |
|---|---|---|---|
| 16510-96J00 | Oil filter | DF40-DF50 | Find on Amazon → |
| 5033102 | Oil filter | DF40-DF50 | Find on Amazon → |
| 763364 | Oil filter | DF40-DF50 | 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 Suzuki DF40 (40 hp)?
The Suzuki DF40 uses the oil filter sold as Sierra 18-7915-1, 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 Suzuki DF40?
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 Suzuki DF40?
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 Suzuki DF40?
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 Suzuki DF40?
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
- Suzuki DF90 oil filter
- Suzuki DF60 oil filter
- Suzuki DF140 oil filter
- Suzuki DF70 oil filter
- All Suzuki maintenance guides
- Free Suzuki boat valuation
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