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Maybe someone can jump in here and help on the oil temp issue but I dont think it will be any hotter than the coolant temp under moderate loads.
If you go with the coolant method, thermostatic controls are not an issue, it will not get higher than your coolant thermostat temp and you can use a heater control slider to control your valve to the HAI heat exchanger.
I am a little puzzled that you say you dont want to mess with the coolant side. Where are you going to tap into for the oil for a high pressure oil supply? For a coolant system I would buy one of those tees that you get to flush your coolant and just tie it in paralell with your heater core. For the heat exchanger I would just use a heater core. I dont for see more than $30 on parts if you get a used valve, heater core and new hose.
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