Outboard Engine Oil Change
A four-stroke outboard oil change every 100 hours or once a season is the single highest-return hour of work on the motor, and it is the one job most owners put off because of the drain pan.
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⭐ X.X from N reviews · Used oil hauled away · Published flat rate
Why the drain pan is the actual problem
Outboards hang off the transom, vertically, over water. That's the whole difficulty — not the mechanical job, which is simple, but doing it without putting oil in the river.
Between the drain plug position, the angle the motor has to sit at, and having nowhere to put a pan, it's a job that's easy in a workshop and genuinely awkward at a dock. Most people who skip oil changes aren't lazy about it; they just don't have a clean way to do it where the boat lives.
We do it with extraction equipment and take the oil away. No pan, no spill, nothing left with you to dispose of.
Marine oil is not car oil
Worth knowing before you top up with whatever's in the garage.
Look for FC-W. It's the NMMA certification for four-stroke marine oil. Marine-specific oils carry corrosion inhibitors that automotive oils don't, because a marine engine spends most of its life switched off in a damp environment — which is exactly when corrosion happens.
Marine engines work harder than car engines. A car spends most of its time at a fraction of available power. An outboard at cruise is at a large and sustained fraction of full load, with no gearbox to hide behind. Oil in an outboard is doing a harder job.
Moisture is the enemy. Short runs and long layups mean condensation in the crankcase. Used oil in a marine engine is often more contaminated by water than by mileage, which is why the calendar interval matters as much as the hours.
Viscosity is engine-specific. 10W-30 and 25W-40 are both common. Use what your manufacturer specifies rather than what a car needs.
About "2-stroke oil change"
A common search, and worth answering plainly: a two-stroke outboard has no engine oil to change.
There's no crankcase reservoir. Oil is delivered with the fuel — either premixed by you, or metered by an oil injection system from a separate tank. Nothing gets drained and refilled.
What a two-stroke does need:
- Gear oil in the lower unit — same as any outboard, and probably what you're actually after
- The oil injection tank kept topped, or the premix ratio confirmed — ratios vary and getting it wrong matters
- The injection system checked if it has one, because it fails toward not delivering oil
If someone has quoted you for a "2-stroke oil change," ask which of those they mean.
What we do
Engine oil and filter, at your boat:
- Motor brought to temperature so the oil flows and carries contaminants with it
- Oil extracted or drained cleanly, depending on the motor
- Filter replaced — marine filter, not an automotive equivalent
- Refilled to spec with the correct grade and quantity
- Run, checked for leaks, level verified
- Old oil and filter taken away
We look at what comes out. Milky oil means water is getting somewhere it shouldn't. Metallic content means wear. Fuel smell means a fuelling problem. The oil is a free diagnostic and it's worth reading.
Done at your slip, lift, driveway or storage lot. How on-site service works.
How often
Every 100 hours or annually, whichever comes first — with the annual part applying even to a motor that ran ten hours.
Always before winter storage. Used oil is acidic and contains water. Leaving it in the crankcase for five months does more harm than the running did. If you only change oil once, change it in autumn rather than spring.
Included in annual service, which is usually the cheaper way to have it done.
Confirm your motor's interval with us — capacities and grades vary.
Doing it yourself
Perfectly reasonable, if you have somewhere to do it.
What you need: the correct FC-W oil in the right grade and quantity, a marine oil filter, a new drain plug washer, and either an extraction pump that goes down the dipstick tube or a way to position a pan under a vertically mounted motor.
Warm the engine first. Cold oil leaves contaminants behind.
The extraction route is usually easier on an outboard than draining, and it's the only realistic option with the boat in the water.
Disposal is your responsibility and it matters. Used oil goes to a recycling facility, not a bin and certainly not the water. Most auto parts shops take it free.
Don't overfill. Outboards are sensitive to it, and overfilling causes more problems than being slightly low.
If that sounds like more trouble than it's worth, that's the honest reason this service exists.
What it costs
Published flat rate by motor size, oil and filter included, used oil taken away. See pricing.
Cheaper as part of annual service, where it's already on the list.
Frequently asked questions
How often should outboard engine oil be changed?
Every 100 hours or annually, whichever comes first, and always before winter storage.
Can I use car oil in an outboard?
Not advisable. Marine oils are FC-W certified and carry corrosion inhibitors that automotive oils lack — which matters because outboards spend most of their lives sitting in a damp environment.
Do 2-stroke outboards need an oil change?
No — there's no crankcase oil. They need gear oil in the lower unit, and either premix at the right ratio or a working oil injection system.
Can you change the oil with the boat in the water?
Yes. We extract rather than drain, so there's no pan and no spill risk.
What do you do with the old oil?
We take it and the filter away for recycling. Nothing is left with you.
My oil looks milky. What does that mean?
Water is getting into the crankcase. Get it looked at before running the motor further — start here.
Should I change the oil before or after winter?
Before. Used oil is acidic and holds water, and five months of it sitting in the engine is worse than the running that made it.
Is engine oil the same as gear oil?
No — different oil, different place, different job. Gear oil is in the lower unit and gets changed separately.
Book an oil change
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