I've got a 1996 C280 with the straight six engine. I tried to do an oil change today, but couldn't remove the filter cap. I know there are tools for this job, but there's a few different sizes. 74mm 76mm etc. 14 flute? I just don't know, so could anyone here tell me please? Thanks in advance. p.s. I tried to move it with an oil filter strap, but no go. My mate from down the road had a chain, but I said nooooooo.