Mercedes ML350 PCV Valve Replacement – Fix Oil Leaks & Boost Issues (OM642)

Removing and inspecting the original PCV valve on my Mercedes W166 ML350 BlueTEC with the OM642 diesel engine at approximately 50,000km / 30,000 miles. At the time I reinstalled the original valve, but later replaced it with a new unit — so the comments were correct, it was already showing signs of wear. A worn PCV can contribute to: Boost leaks Oil misting Oily intake pipes Reduced turbo performance Hissing noises under boost Replacement PCV: Mercedes Part Number: 4420101791 https://amzn.to/4b47oDH #mercedes #ml350 #w166 #om642 #pcv #boostleak #diesel #repair #maintenance #bluetec 2021 01 16