Have had my '99 CLK 320 Cabriolet for 9 months now and absolutely love it. When I got the car it had 46,000 miles on it with full service history. I have now put another 18,000 (motorway) miles on it. My problem is that it seems to use a fair bit of oil (compared to other modern cars that I have had over the last few years). I cannot see any leaks and it does not seem to be producing any blue smoke (thank god!). It is coming up for another service soon and will obviously mention to the independent specialist but is there anything I can check first (may pull the plugs this w/e but was thinking more along the lines of breather filters blocked?). Thanks in advance