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For those of waded in, thanks. It doesn't seem as lonely!
And yes, all oils get thin when they get hot. Multigrading additives just mean they do not thin as much as temperature increases(And yes, that is an over simplification statement).
I may regret what I am going to say next:
One thing with an extra oil cooler is to consider one with a thermostat. (Not sure, I have never purchased one, they may all come with a thermostat?) That way the oil cooler comes into play when needed. Running an oil too cold(below the dispersant activation temperature) can cause something, rare but possible, called cold sludging where the oil does not get hot enough for the dispersant to work properly and then can lead to degradation that can cause the oil to thicken over time similar to what you get when an oil sludges from being too hot.
The thermostat also protects the cooler during start up until the oil has warmed up.
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