Servus soon wanted to make an oil change on my car. I would have 2 questions for this: 1. Does the CL have more than one oil filter. Could be, since it already has 2 spark plugs per cylinder. 2. Is special tool necessary? I mean other than these pliers for the oil filters. Since the oil filter itself is not a cartridge, but basically the inside. So only the filter element is replaced. mfg Michael