Suzuki DF140 Oil & Filter Change
Fresh oil and a new filter are the cheapest insurance for your 140 hp Suzuki DF140. Below is the oil filter we recommend, which DF140 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 DF140
SUZUKI 4 Stroke OIL CHANGE – DF140A
Tools Needed
- Allen wrench (provided by Suzuki)
- Oil filter wrench
- Screwdriver (flathead and Phillips, provided by Suzuki)
Safety
- Wear gloves to protect your hands from oil.
- Be cautious when handling the engine as it can be hot after running.
Steps
- Remove the cowling to access the engine components.
- Use the provided tool or a screwdriver to break loose and remove the six screws holding the side panel.
- Take off the side panel to expose the oil filter and drain plug.
- Using the Allen wrench, loosen and remove the oil drain plug. Replace the old compression fitting with a new one from your maintenance kit.
- Drain the old oil into a suitable container.
- Remove the oil filter using an oil filter wrench. Apply a thin film of oil to the surface of the new gasket before screwing on the new oil filter (part number 16510-61A31).
- Hand-tighten the oil filter until the gasket contacts the surface, then give it three-quarter turn.
- Replace the oil drain plug and tighten it by hand, ensuring not to overtighten.
- Refill the engine: about 5.7 litres (6.0 US qt) when the oil filter is replaced, or about 5.5 litres (5.8 US qt) without a filter change, using marine-grade 10W-40 (Suzuki recommends X-Star 10W-40 FC-W certified marine oil). These figures come from Suzuki's published oil-capacity chart for the DF140 and DF140A, not from a Suzuki manual we hold. Check the manual for your own model year before filling.
- Check the dipstick level and adjust the oil quantity if necessary.
- Run the engine for about ten minutes, then check for any leaks and recheck the dipstick level.
- Turn off the engine and let it sit for a few minutes before rechecking the dipstick level one last time.
- Replace the cowling and side panel.
Tips
- Always use marine-grade oil to maintain your Suzuki outboard's performance and longevity.
- Reset the digital readout by pulling the safety stop switch three times after changing the oil.
Which part do I need for my Suzuki DF140?
For most DF140 owners the part above (18-7897) 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 | |
|---|---|---|---|
| 16510-82703 | Oil filter | DF140 (2001–2008) | Find on Amazon → |
| 5033919 | Oil filter | DF140 (2001–2008) | Find on Amazon → |
| 778887 | Oil filter | DF140 (2001–2008) | 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 DF140 (140 hp)?
The Suzuki DF140 uses the oil filter sold as Sierra 18-7897, 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 DF140?
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 DF140?
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 DF140?
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 DF140?
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 DF70 oil filter
- Suzuki DF9 oil filter
- All Suzuki maintenance guides
- Free Suzuki boat valuation
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