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Old 12-05-2012, 08:13 AM
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Fudman Fudman is offline
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Location: Sudbury, MA
 
Join Date: Apr 2007
Posts: 6,047
Mein Auto: '02 530i Sport auto
Very interesting thread. Last spring (May), I replaced my entire cooling system, including t-stat. There was no noticeable difference before or after, in performance or gas mileage. Soon thereafter, I replaced my O2 sensors and got a noticeable 1-2 mpg improvement in gas mileage. However, I am now noticing (now that cold weather has hit) that the car also takes longer to warm up. My car was usually fully warmed up by the time I hit my first stoplight. Now the temp dial is at the 10-11 o'clock mark at that light. On cold mornings (20s F), it is closer to 10 o'clock. I thougth I was just imagining things but your experience is somewhat similar. And my mileage has noticeably decreased about 1 mpg, from previous cold seasons, so it isn't just winter gas. Now you have me thinking Behr issued a bad batch of T-stats. Hmmm...
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