How to Change the Engine Oil on a Four-Stroke Outboard | BoatUS


Hey there, folks! Lenny Rudow here for BoatUS Magazine. Today we’re going to take a look at changing
the powerhead oil in a four-stroke engine. Now, we have with us Benny Quinn, who is an
outboard mechanic with how many years of experience, Benny? About 30 years. About 30 years. So this guy knows his stuff. Now of course changing the oil is a fairly
simple process, but here’s where it gets interesting. It’s different on different engines. Mine, for example, has ports right here. I just take a wrench, pull the plug, and I
can drain the oil right here. But with this Yamaha F175, there’s an easier
way, isn’t there, Benny? Yes. The drain plug for this engine is behind this
cover, so instead of pulling this whole cover off, you can actually go through the dipstick
tube to drain the oil and you will get, according to Yamaha, the same amount out through the
dipstick tube as you can from pulling the drain plug. Interesting. Well, let’s take a look at how you do that. [SUCTION SOUND]
Now, Benny, Why do you like this particular kind of pump? Well, I like this one because each of these
rings is one quart, so you know exactly how much you’re pulling out of your engine. Hmm. So if your engine takes 5 quarts of oil, you
should have five of those rings full. Gotcha. That way you know you’ve got it, if your level
is proper. So what’s next, Benny? We pull the tube out, and we go around and
we do the oil filter. Now this is a brand new engine, people, and
this is a brand new oil filter, so we’re not actually going to take it off, but normally
that would be your next step, right Benny? Yes, it would be to take the wrench and twist
the oil filter off and replace it with a brand new oil filter. Gotcha. And then the next thing we do is go ahead
and take off the oil fill cap, put your funnel in, add oil, and pull your dipstick out and
wipe it off as you come out. This is the proper way to do it. Stick it back in and then take your reading,
and make sure that your level is correct. Don’t forget to put your oil fill cap back
on, screw it down til the O-ring seats, then a quarter to half turn afterwards or else
you will hate yourself the next time because it will be so tight that you will have to
use a pair of pliers if you can even get it off at all. Benny, thanks for making that look easy! Well, folks, we hope you’ve found this video
helpful. We hope you’ll watch it and leave comments
in the section below. And don’t forget to go to the BoatUS YouTube
channel and subscribe. Have a good one!


8 Responses

  1. America The Truth Speaks Volumes

    May 11, 2018 3:41 am

    Brother your the very best of them all that explains everything about outboard motors. Thanks for learning us all so much that we don't understand know or forgotten all about
    Pure Awesomeness outstanding knowledge ❤

  2. America The Truth Speaks Volumes

    May 11, 2018 3:43 am

    What's the name of the awesome pump this guy is using on this oil change on this outboard motor???


  3. Dan E

    August 9, 2018 2:28 am

    I wish you would have demonstrated the technique for removing the oil filter without dumping oil all over the engine. The oil filter is inverted and full of oil. The moment you loosen it sufficiently, it will dump all that oil all over the engine and eventually out of the small crevices in the case.

  4. Robert Magas

    August 9, 2018 5:44 pm

    I would have liked to see the oil drained through the drain plug rather than the dip stick. I haven't been able to figure out how to do it through the drain without making a mess. Yamaha gives little info. Maybe this can be addressed?

  5. Bruce Smith

    April 28, 2019 9:39 pm

    Did you have to run the engine first to heat up the oil before you removed it? If so, how long did you run the engine?


    January 28, 2020 1:28 am

    Thanks for sharing this great tip! Can you say which diameter tube you should use on an F300? The pump comes with both a 1/4 in. (6.7 mm) and a 7/32 in. (5.8 mm) dipstick tube extension tubing.


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