IMHO, this is where the big money maker for dealers is. If you are a DIY type and do the service yourself, you will probably find every part and fluid you need to be under $150 and will take a couple to a few hours.

On my C280, they would charge over $500, but I can do it myself in an afternoon for $100 worth of parts.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record