jassz is the oil line itself broken or is it leaking at the fitting? If you purchase the complete line you will find that it includes the grommet where it goes through the firewall. I suspect this grommet/line is a pia to replace because you have to deal with all the vacuum lines. You can probably deal with it with just the inst cluster out and not have to pull the dash. I put a 6mm tubing union in my oil line on the 300D to put it back together just to keep from having to replace the line through the grommet. The fitting is an "EO" type Parker fitting p/n G08LA3C and can be found at the Parker Fitting website
http://www.parker.com/tfd/cat/pdffiles/H-eo.pdf
Putting a tubing fitting in this line is probably not for the feint of heart though
. We use them all the time around the plant where I work and they are reliable and work well if properly installed.