Glad you received the cooler without any problem. When I took advice on fitting the cooler I was recommended not to fit a stat. Ok, I was rallying the car however, the flow rate through the cooler is not substantial when the car is in "normal" use. The temp of oil during normal use in an engine is 90-100deg C. When we raced without the cooler the temp was 160deg C, and lowered by 10deg when the cooler was fitted. When the car was being used on public roads the temp sat at 100deg whether the cooler was connected or not.