I actually didn't really notice a difference because it would always warm up within a good quarter mile or less before which is why I didn't think anything was wrong with the t-stat. That's one good thing I like about the car is that when its cold as crap outside, it would have nice heat (along with the heated seats) in no time.

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1997 E320
1986 560SEL
1983 300SD
1972 220D
1970 250C SOLD
1971 250C SOLD