I think a higher temperature setting is in order. Assuming the set point is where the thermostat opens. Why? I'll explain where I was headed before I sold my car.
I was brung up to believe that the oil is a lubricant and not a coolant. And that if the oil didn't get above 212 then the condensation inside the pan would be a problem - ie, oil above the boiling point of water.
I always thought the Roush 427IR ran 5oo "cold" for my liking (hardly every above the 190* setpoint of the thermostat). Two reasons:
1. The radiator is huge.
2. The oil cooler just adds to the radiator "exposure".
The net was my engine usually ran cold. I even put in a higher set point thermostat (190?)
If I had added an oil cooler thermostat I would have set it to be above the radiator thermostat so the oil cooler SUPPLEMENTS the radiator and kicks in ABOVE the radiator set point. Let the radiator do its work and let the oil cooler kick in when the radiator is unable to do its job. In reality, that translates to hardly ever
I figure it would have been mostly city stop-n-go since when moving the radiator is actually oversized and the engine runs cool.
185 might be too low, 220 too high.
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