I've got a minor oil leak on my C280 - near the firewall by the oil filter.
I can not seem to actually see the leak - but after a couple hour hi-speed
run - I can find a little oilly smoke coming from that portion of the
engine.   Since access is limited ----- what should I look for?    Is the
pressure sensor somewhere under the oil filter?

Are there any good drawing on the web?   Or a reference to purchase a good
manual or CD with drawings / diagnosis information

thanks
curtis