Legend Boats Blog


How To Change The Oil On Your Outboard Motor

We’re thrilled that you bought a Legend Boat and want you to enjoy it for years to come. A critical part of long-term boat ownership is regular maintenance. The simple act of regularly changing your outboard motor’s oil can extend its life by years. These boat motors work harder than a car engine and deserve a little TLC.

Legend Boats and authorized dealers provide this service for you, but if you’re the DIY type here’s how to do it:

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  • About 4 Litres of new engine oil (25W-40 is the most common, but make sure to double check what the manufacturer recommends)
  • A Funnel
  • A Rag
  • A 5L catch pan
  • Filter wrench (unless you’re feeling tough)
  • An adjustable wrench
  • A Replacement Filter (Mercury Outboard 35-877761K01 recommended)




You should be changing your oil after every 100 hours of use. This is about once a year for most boaters. We recommend doing this at the end of the season so that everything’s fresh and ready to go in the spring.


*New motors should have their oil changed after the initial 20 hour break-in period.




  1. Run your boat for 10-15 minutes to get it up to operating temperature. Colder oil isn’t as viscous which means you can run the risk of leaving old/dirty oil behind.

  2. Place your catch pan under the drain plug. It’s always a good idea to use a slab of cardboard to make sure oil doesn’t accidentally get on the ground or garage floor.

  3. Remove the dipstick and oil filter cap. This allows air to get into the motor which lets the oil flow out of the nooks and crannies more freely. Place some rags in key positions to protect the bilge area from getting oil all over it.

  4. Place the drain hose into the catch pan and use your adjustable wrench to remove the plug. Let the oil flow.

  5. Remove the oil filter by turning it counter-clockwise. You can do this by hand, but often enough it’s on there tight and may call for a filter wrench.

    Once all of the oil is drained, it’s time to start putting everything back together.

  6. Dip your finger into the new oil and use it to lubricate the seal on the new filter. This ensures an airtight seal. Also make sure to clean off threads and seal where the new filter goes.

  7. Screw the drain plug back in and, using a funnel, proceed with pouring the new oil. Your motor should call for 3.8L but, again, check with your manufacturer’s recommendation.

  8. Wait 5-10 minutes for the oil to settle into place and check the levels with your dipstick. Add more if needed.

  9. Make sure to check for leaks. A cracked seal or mis-thread could lead to a few drips. Replace the dipstick and Oil Cap, and you’re all set!

  10. Clean up. Whenever you’re working with oil make sure to dispose of it at a household waste recycling facility. It may seem like no big deal at the time, but there really is no acceptable level of oil on our kids’ drinking water. Spend a few minutes to do the right thing.



  • If you want an ultra-clean oil change, opt for a pump. You can access your oil through the dipstick hole and feed it directly into the catch container without spilling a drop.

  • Write the date of your oil change on the oil filter. You’ll never have to wonder if you forgot to do it this year or change it way too early or way too late.

  • Take your fishing boat out for a short run after your oil change, and check the dipstick again. After running it for a short while you’ll often find that levels drop a little bit and need a top off.

Boats that are well taken care of are more enjoyable while you own them and worth more if you ever plan to trade in for a brand new Legend. We’ll be producing plenty more DIY tutorials to help you keep your boat well maintained, so make sure to check in often.


If you decide that you need a little help this season, we got you covered.

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