Recently took my car in for a complete service check. The shop is Atwood European here in Phoenix. They did this repair on my car and is the 2nd time in the 3 1/2 years I've owned it. First time was when I first bought the car new after sitting 2 years. Andrew told me that if the car sits alot then you should have it checked twice a year. If the car is used all the time then it's good for 50k miles. Also said was normal maintenance on all E's SL's C's etc.. Mine wasn't leaving any puddles yet or any that I noticed.