160 T-Stat to low?
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The OP (or anyone else) has the ability to tweak the thermostat and keep the motor within a good temperature range with a simple shim, which cost less than $1. That is what most aftermarket thermostats do and most are not tested for opening temperature. So unless you test the ones being sold you really don't know what you have.
Besides that fact, your gas mileage will reduce significantly using a colder tstat if your computer isnt set up to run that colder temp. Your computer probably doesnt get into closed loop operation till a hotter temp.









