+1 but I am doing it with N/A motors. I am starting to suspect I need a design change with the Teague coolers. Maybe a 4 Pass instead of 2? Even though they are the biggest coolers available, maybe even bigger is the key.

I am also checking into venting the raw water at the strainer to get the air out.
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i have been told that if the oil temp never gets above 212,then the water /moisture never boils off.the guy at merc said between 200-250 is ok.just my 2cents.my fountain runs around 230-240.

That is not hot enough. You have to get the oil to at least 212*F to burn off condensation. An oil thermostat should be in your future.

Mine will get up to 250-260* after a long WOT pass.

A heavier oil runs hotter due to more friction...I have used Amsoil Marine 15W-40 and it's a great 40wt product.

I have heard statements regarding this multiple times, and here is what I think regarding that. Water boils at 212*F water does not need it to be 212* to evaporate. At 180*, the water will evaporate in no time. A pool evaporates water at 80*. Now what happens when a drop of water hits the connecting rods which are going to be hotter then hell. Goodbye water drop.

I agree with that statement, but have to ask why the manufacturers make oil thermostats designed to keep the oil above 212* then?

Water will evaporate much faster when it is boiling than when it is just hot.

Running 50wt may try 20-50 to reduce temp.

I agree with you that water will boil much faster at a higher temp. I have no idea why the oil thermostats are designed to keep the oil thermostats above 212*. It would be interesting to see if you can monitor that with the merc computer while a engine is running.

+1
Ice cubes evaporate in you freezer

Just seems like everything that I read about oil temps says that an engine should always maintain AT LEAST 190* oil temps, and if a 212* thermostat is not installed, the engine should be run hard enough for enough time to get the oil temps up to over 212* in order to burn off condensation. maybe some experts will chime in and let us know what the deal is.

If this isnt necessary, I can sure save a lot of gas by not running 5000rpm all the time and cruise all day at 4200rpm with 180* oil temps.