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0w20 flows extremely well and can be operated in the 175-185F range and oil pressures will be excellent. If you are running a cooler with no T-Stat and you are always in those temp ranges you are good.
But if you are struggling to get up to those temps in warm climate on a daily driver you will want a t-stat. I would always running a t-stat cooler on a street car, which 95% of the cars on this forum are.
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