Our car is a BWA engined manual, I was a bit miffed when I had the main 'stat changed only to learn that it had an inline one as well.
The not getting up to temp' started again a bit later and had to have the inline one changed as well. I wish they had said about it having two as it could have been changed when it was drained down.
Spot on after the second one was changed, gets up to 90 in less than 3 miles.