Im doing my H22 buildup with Type S pistions, 0.02 mill, thin head gasket and flat valves, which I calculated would bring compression to close to 12:1

I hope to keep the longetivity of the motor and ensure its running safe at ambient temperature. Can someone fill me in with more info?

 

Im not totally sure of your question, but yes, an oil cooler is very good for engine longetivity. Youll notice that many high powered cars come with them stock. I am (was/will be again) running a B&M one, its not the fanciest, but it does the job just fine. Good investment