I checked the old thermostat, water spills through the valve although it looks closed. I guess it was letting water pass it shouldn't have thus cooling the motor.

I am up to 15.1mpg on the display, previous best (although averaging 14.6mpg actual) was 13.2

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BMWCCA # 480346

'72 e6Tii rip
'90 e30iC sold