Put in new T-stat, drove to recycling center to dispose of old coolant then drove to work in ambient temps of 65-68F. Now OBC displays 95C when moving (occasional 96C) and moves between 96-99C when stopped or in traffic. My old T-stat was either stuck open or opening too soon. Old T-stat was BMW brand with 85,000 miles on it. New T-stat is Wahler with 10 miles on it. In 4-6 weeks I should know if this improves my gas mileage. Edited table below.
Numbers are in Celsius once reached a plateau.
Oli77: 96
Dane: 95
Telijah: 88
edlvrt: 96
MrMaico: 96
Spencers: 90
LivesNearCostco old T-stat: 91 (77-91 while moving)
LivesNearCostco new T-stat: 95 (95-96 while moving)
derbo: 95
GT172I: 96
shanneba: 89
Hochspannung: 87
Kayger12: 95
RITmusic2k: 83
terraphantm: 95
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