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Old 06-24-2008, 07:12 AM
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Default Mercury 125 Outboard Oil Reservoir Problem

I have a 2004 Mercury 125 outboard on my Trophy 1903 center console. There is access through the top of the engine cowl to check the 2 stroke oil tank fluid level. When my engine is tilted up for towing this cap/dipstick leaks oil all over the engine well. The cap is "twist-on" and has a rubber "O" ring seal. I have replaced this a couple of times but it only lasts a few months and starts pouring oil out again when tilted up for towing. Has anybody else experienced this problem and/or have a suggestion for a long term fix? Thanks for reading.

Ed
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Old 06-24-2008, 07:25 AM
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Default RE: Mercury 125 Outboard Oil Reservoir Problem

you may have a defect in your tank if you have to change the lid every now and then. this is a v ery common problem and i find most of my customers deal with it by filling their oil tank before they go out (after mtr tilted down), then the tank will hopefully be 1/2 full for storage by the time they get back. if i had your serial number i could look up how much a new tank goes for or you can look it up yourself at our site.
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Old 06-24-2008, 08:35 AM
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Default RE: Mercury 125 Outboard Oil Reservoir Problem

I used to have that same engine (and boat too) and witnessed the exact same problem.

My solution was to keep the oil level at less than full. A full tank of oil is good for a full tank of gas - approx. 150 to 170 miles running. Filling it up to the halfway point was often good for a typical days trip. The oil alarm used to sound for me when the oil level falls to the last half gallon (50 miles to go), so adding a quart or two, keeping the partially full jug in the back hold, was mostly painless.

Also, I seldom tilted all the way up and over to the point where the locking support flipper was used. This was a trailer boat. For running on the trailer, I trimmed up so that the skeg had about 1-foot of clearance to the road, which was plenty for most ramps and curbs. If you're in a slip and have to trim full up and locked, then you're going to see that oil tank leak. It's a feature!

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Old 06-10-2013, 10:54 AM
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Default Oil leaking

Quote:
Originally Posted by boattune View Post
you may have a defect in your tank if you have to change the lid every now and then. this is a v ery common problem and i find most of my customers deal with it by filling their oil tank before they go out (after mtr tilted down), then the tank will hopefully be 1/2 full for storage by the time they get back. if i had your serial number i could look up how much a new tank goes for or you can look it up yourself at our site.
Hi!
I just joined this forum today after noticing this post online. I also have this problem with my Merc 125. I can actually see the oil leaking out of the top of the fill tube. I'm aware of how old this thread is, but have there been any improvements or upgrades to address this issue. There's oil EVERYWHERE!!
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