Hi Jiwan, Yes, this fits the 2009 CLS 550. To check the fitment please use our Vehicle Selector — which can be found towards the top of the homepage as well as all categories, search results, and product pages — can help verify if a part will fit your specific application. To enter your application, simply select your vehicle’s year, make, model, sub-model, and engine type and click “Go.” Once your application is selected, you’ll see a “Guaranteed to Fit” badge if the part will fit, and we recommend that you also double-check Your Vehicle Fit Details as well as the Vehicle Fitment Information table on the product page.

I installed on 2006 E350. Install was quite simple and parts were correct fit.

Hi Adrian, thank you for reaching out! I am happy to confirm that it will fit your vehicle. Click the link below to order the kit while stocks last. Have a great day! https://www.carparts.com/crankcase-vent-valve/replacement/rm31660002?can=cpab2020_csqa_202406027

Hi Rocco, I'm glad to assist you. No, you don't. Click on the link below for direct ordering to take advantage of our limited stocks. I hope this helps, and happy shopping. https://www.carparts.com/crankcase-vent-valve/replacement/rm31660002?can=CPAE1047_CSQA_20240215

Hi F, I'm glad to assist you. No, but this is a direct replacement aftermarket kit. An exact replica of the original ones from Mercedes Benz. I hope this helps, and if you're interested in this crankcase vent valve kit, you can click on the link below for direct ordering to take advantage of our ongoing sale and limited stocks. Happy shopping. https://www.carparts.com/crankcase-vent-valve/replacement/rm31660002?can=CPAE1047

Hi, Yes, this is guaranteed to fit the 2008-2012 Mercedes Benz C300 all submodels and engines.