I had to install a chain in my Mom's '85 190E and I did install the oiler. It works great now with no noise or stretch after 30,000 miles!! I think it is a must.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM