i have changed oil , filter (mercedes)several times used synthetic and regular oil
its common with the m117 engine..they use plastic oiler tubes and sometimes the plug on the end of them pop out and thats what causes the ticking noise..i would replace them with metal ones if you can find them, if not just replace the oiler tube with the missing plug and you'll be all set!
Can this noise cause damamge to your engine?
no, since the originals are made out of plastic they get chewed up and ground down but it's not something i recommend keeping..you should switch to the metal oilers..it will fix the ticking noise and last much longer
Looking for a Used E-Class in your area?
CarGurus has 20,664 nationwide E-Class listings starting at $2,495.
Search Mercedes-Benz E-Class Questions
Mercedes-Benz E-Class Experts
Related Models For Sale
Used Cars For Sale