Hi all, this is my first post on here after purchasing my 2005 c180k avantgarde 3 weeks ago. It was due a service when i bought it so being fairly competent with a spanner i thought i'd give it the works. It's only done 22k but i thought i'd treat it to the following. renewed oil and filter, air filter, pollen filter, fuel filter, spark plugs, brake fluid, diff oil, and coolant. (all OE parts) Now when doing the coolant my Haynes stated it requires 8.6l of coolant and shows that the block has a drain plug as well as the radiator. Now, can i find this? can i s***e. I'm presuming that there is one as i can only drain 6l from the rad drain. i have done this for now, but really want to renew the lot. Can anyone show me or describe where this drain plug is as i really cannot find it at all. Thanks, Alex.