I am new to Mercedes and I just had my oil changed at a local (non Mercedes) garage and the oil cannister lid was too tight to get off with bare hands. Since the arrow on the lid indicates counter clockwise rotation, I was afraid to put a wrench on it and turn it without knowing for sure which way loosens the lid. Is it clockwise to tighten or clockwise to loosen? Do I need to use a special tool to get this off?

Thanks for your help!

Larry