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  #1  
Old 08-14-2021, 02:56 PM
Jethro Jethro is offline
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Default Opinion on annual oil change

I moved to a lake that is under 80 acres. While I use the boat to fish a couple times a week, I'm only driving it a few blocks at most and around 5mph.

Any opinions on dropping the annual oil and filter change down to every other year as I'm never really stressing the motor or even under power much? I haven't even used a quarter tank of gas yet this season.
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  #2  
Old 08-14-2021, 03:29 PM
clawman clawman is offline
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Quote:
Originally Posted by Jethro View Post
I moved to a lake that is under 80 acres. While I use the boat to fish a couple times a week, I'm only driving it a few blocks at most and around 5mph.

Any opinions on dropping the annual oil and filter change down to every other year as I'm never really stressing the motor or even under power much? I haven't even used a quarter tank of gas yet this season.
I'd be more concerned about NOT getting adequate heat into the engine to operate as designed. Can you run at WOT at least a couple of minutes each day of fishing? Then to the oil, it is cheap compared to moisture or fuel diluting the lubricity of the oil.
I'd change it.
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  #3  
Old 08-14-2021, 03:35 PM
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CI_Guy CI_Guy is offline
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Just putting around like that I would be changing the oil every year to get rid of the condensation of gas and water in the crankcase. When you open up the throttle and generate some heat you can get rid of most of the water and gas vapors before they condense and mix with the oil. I always figure oil is cheaper than a rebuild.
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  #4  
Old 08-14-2021, 04:15 PM
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Oil is the cheapest preventative service tool there is.
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  #5  
Old 08-14-2021, 06:26 PM
Jethro Jethro is offline
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Hmmm. Guess I'll contact Yamaha, and perhaps downsize boats if they concur on need for WOT driving.

I'd feel like a goof driving around this little lake at 50mph. 😕
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  #6  
Old 08-20-2021, 11:41 PM
REW REW is offline
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Jethro,
I suspect that the recommended oil change for many of today's outboard motors is 50 hours of use.

But, as is your case, check the oil's appearance if you drain a bit out and check for the condition of the oil. If there is no moisture in the oil - as indicated by a "milky" appearance to the oil - very little reason to change the oil at the end of the season with such few hours of use

The same is true of lower unit oil.

After the engine has been sitting idle for a week, remove the bottom drain plug and check the appearance, color and condition of the lower unit oil.

If the oil is oil colored with no appearance of milkiness, and or if no moisture came out of the lower unit - when the bottom drain plug is pulled for a couple of seconds - there is little reason to change the lower unit oil. In my case, I think that the last time that I changed lower unit oil was 5 years ago Not a lot of hours on the motor each year any more and thus, with no moisture in the oil - no reason to change the lower unit lube.

But if you want to change the oil and do service on the motor once every 30 days or some other time interval - fine. Your equipment, your money and your decisions.

Take care
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  #7  
Old 08-21-2021, 09:55 AM
bubba800 bubba800 is offline
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Quote:
Originally Posted by Jethro View Post
I moved to a lake that is under 80 acres. While I use the boat to fish a couple times a week, I'm only driving it a few blocks at most and around 5mph.

Any opinions on dropping the annual oil and filter change down to every other year as I'm never really stressing the motor or even under power much? I haven't even used a quarter tank of gas yet this season.
With that usage I would double my oil changes.
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  #8  
Old 08-21-2021, 10:17 AM
troller71 troller71 is offline
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For what it costs definitely change every year. You need to work that engine way more than that.
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  #9  
Old 08-21-2021, 10:14 PM
REW REW is offline
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Jethro,

Do yourself a favor and once a month take your boat and motor to a bigger lake and ring it out and run it for a couple of hours at wide open throttle. You will enjoy the ride.

Good luck
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  #10  
Old 08-23-2021, 07:35 PM
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Mark Pothen Mark Pothen is offline
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Another one on changing it.
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