Recent content by sec56

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    Mercury 2-Stroke Oils

    I don't remember who I ordered the DFI oil from. I did find out that there is a date code or date of manufacture on the oil containers which could be checked. Also found out that Mercury supposedly reformulated their DFI oil to help prevent the gelling issue, but I don't know when that happened...
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    Mercury 2-Stroke Oils

    New question. I've had both Evinrude's and Johnsons. My last one was a 1999 175hp Evinrude Ficht. which was on the boat I bought back in the early 2010's area. I was very hesitant to by this boat at the time due to the bad pr about that engine. After one answer on a forum about this, it was...
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    Mercury 2-Stroke Oils

    Are there any additives to prevent gelling or retard it. During winter months refineries add anti gelling compounds to diesel fuel. I've never heard of any such thing for 2 stroke oil, but I am curious.
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    Mercury 2-Stroke Oils

    I found a post that answers a good part of my questions about those globule or gelling. https://www.bbcboards.net/showthread.php?t=23389. In this post it talks about gelling and compatibility between Mercury' Premium Plus and Mercury's DFI oils. If there is anything someone thinks I should...
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    Mercury 2-Stroke Oils

    I had a Mercury Optimax rebuilt back in 2019-2020 during covid. The Mercury dealer that rebuilt the engine had told me that Quicksilver Premium Plus synthetic was good for that engine. Later, I found out that the Optimax requires DFI oil, so I began running Mercury DFI synthetic blend oil. The...
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    200hp Optimax Intermittent Overheat

    Update: We took the 200hp Opti out fishing Monday and only caught a sheepshead (freshwater drum). Engine ran fine, no alarms. We put on approximately 48 to 50 miles on Lake St. Clair and the full length of the St. Clair River up to Port Huron and back. Beautiful day and a nice cruise with...
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    200hp Optimax Intermittent Overheat

    Low rpms, maybe up 1000 rpm. And again, intermittent overheating. It happened twice in approximately 7 hours. Probably 60% to 75% the engine was running 4100rpms to 4500rpms. No issues with/at the higher rpms. I noticed after changing the water pump, at 750 to 1000 rpms the stream of water it...
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    200hp Optimax Intermittent Overheat

    I had a 200hp Mercury Optimax rebuilt back in about 2020 give or take a year or two. There have been a few issues since I've owned it. A few of the issues are 1, magnet came off foam float in engine mounted oil tank, water if fuel, and a overheat condition when first started. With the overheat...
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    2011 15hp HO Evinrude

    So I had a water issue in my gas causing both my 200hp Optimax and the above Evinrude to have problems. I've drained my forward gas tank (32-gallons) and put fresh gas in it with fuel stabilizer. The Optimax ran fine. The 15hp Evinrude ran fine too, until it got warmed up, at which time it...
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    2005 200hp Mercury Optimax Water in Gas

    6-gallon tank was just for test running here in the driveway. Forward 32-gallon tank has fresh gas a stabilizer in it. Ran it today in Lake St. Clair. No alarms or issues with the 200hp Optimax. But the Evinrude was giving me a problem shortly after it got warmed up. But that's a new post...
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    2005 200hp Mercury Optimax Water in Gas

    Update, my Evinrude/Johnson 6-gallon tank leaks fuel at the connection point, with or without a hose attached. At this time, since parts for this tank (fuel gauge) are no longer available, it's junk. So I bought a used plastic outboard 6.6-gallon fuel tank. Although it was dry inside, I had...
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    2005 200hp Mercury Optimax Water in Gas

    Dingbat, as stated above, I had added isopropanol alcohol (ISO-HEET) to my gas. There is no visible sign of water in the bottom of the bowl on my water separator, no cloudiness either. No sign of water when I drain gas into a glass container. The filter is 10 microns. Should the WIF sensor...
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    2005 200hp Mercury Optimax Water in Gas

    I found today that even though water mixed in isopropanol alcohol, Mercury's WIF sensor can still sense the water in the mixture even though it's not visible in the bowl of my fuel/water separator. So, it looks like an upcoming tank drain (2 tanks) of approximately 80 gallons. I'll run it...
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    2005 200hp Mercury Optimax Water in Gas

    MUC, my Optimax is direct fuel injection, so except for blow by past the rings, I don't know if there is any effect to internal moving lubricated parts from the chemical additives. I don't normally use additional chemicals other than what Mercury Marine recommends. I may use Stabil Marine fuel...
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    2005 200hp Mercury Optimax Water in Gas

    I did install 10-micron separator with a site bowl. No signs of water in the bowl and the gas is not cloudy either. The fuel I've drained is running fine in my other gas engines with no problems. This is my first Mercury and I'm not sure how much fussier the Optimax is. I did drain the vapor...
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