Originally Posted by asianstutter
I bought my 06 330xi used at 107000km. How can you find out if the water pump has been changed? now i'm at 117,000
Check to see if the T-stat is plastic or aluminum. It is common to swap the t-stat when you do the pump and the updated design is plastic vs the originals aluminum. If you have an 06 and your t-stat is plastic someone must have swapped it already. See this thread for more detail:
the 9th pic is the t-stat shown in the original aluminum material. The 20th pic shows the updated plastic design.