You may or may not know that I have a 2003 W209 CLK 240 with the 2.6 M112. I've owned it since May last year, two owner car and I picked it up with 79k miles and I've since put 6k miles on it. It's had 3 oil changes since I bought it (one on purchase, one after 6 months, one after 12 months) and...