Yeah 180+ is fine on temps. The thermo plate helps mostly with two things: street driving in cooler weather, and warmup times. Without a thermo, it takes significantly longer to bring the oil up to temp from overnight cold, and highway drives in cool weather can suck oil temps down to 160 or lower (probably much lower, if you live in a state that has a real winter).
Another alternative is to velcro a block-off plate over the cooler in cold weather conditions on the street.
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