what is the advantage or disadvantage to running without a thermostat.

some say you don't need to because water temp is not needed as much as oil temp. also the cooler operating temp increaces the life of the motor and the oil is going to get hot enough to burn off the moisture if any when you run it hard.

is this true when you are putting around most of the day and you don't realy run it hard. will the oil get hot enough. or are you just mixing the condensation in your oil.

let me know

I personally would keep the thermostat if it already has one. If the water is cold enough, say 60 or less, you will get some condensation in your oil unless you realy run it hard and long enough to heat the oil up to over 200 degrees. That is hard to do in cold water unless you are really reving it. I do not have thermostats in my motors because my engine builder builds his motors to run WFO for long periods. As a result I get some condensation in my oil in winter. In the summer I run cooler than I otherwise would however. It's a trade off.

what about the rust on your valve springs

what is WFO? do you mean WOT?

WFO is faster than WOT....Wide F___ing Open! I run mine enough that not too much condensation remains under the valve covers. I always make a habit of pulling the filler caps off and looking to see if there is any yellowish looking gunk under there. If there is you need to heat the oil up some...or change it.

WFO - Wound Flat Out is the original family-safe version.

I did not see what motor you are running. An oil cooler thermostat will help keep the oil temp up if you run without a water thermostat. I wouldn't reccomend no thermostat unless it is really needed. Condensation in the oil is the negative to me. If you run a electronic fuel injected (EFI or MPI) motor the cooler engine temps can cause your motor to run rich also.

I don't run in the salt water much but I was told once that the cooler engine temps will help with corrosion in salt water. Don't know if that is true or not just something I heard or read some where.

Hello Guys,
In cool water, warming the oil is harder and condensation is more of a problem. I always try to run PCV on every engine. This helps more than most think to help with the moisture. An engine coolant thermostat is and individual call. If your boat and weather keep things too cool, you need the thermostat. An oil thermostat, however, is something you definitely need. Warming the oil to 212* is a very good thing. Too hot or too cool is a problem. Ask any petroleum engineer!!! Some popular thermostats for oil come with low and high temp thermostats, the high beeing about 212-215*. GET THE HIGH ONE!!!

Is it true that exhaust reversion can also cause condensation in the oil ?

If this is so I presume that the reversion is such that you neither notice the difference in the way the engine runs/engine does'nt lock up ....

you will know the difference between condensation and reversion if you are running in salt water. condensation is not salty however if you are running fresh water there is no way to tell.

thanks guys

I do not see any way the exhaust reversion can get into the oil or cause any condensation there. You may have valve and/or valve seat problems, rusted cylinder walls, etc., but the reversion cannot get directly into the crankcase.