I think i remember a thread about this a while back. seems to be a common problem with the Z's. whats the exact cause(s) of the smells. What did you guys do to fix/get rid of the problem?

zboi,

The last thread on this subject was 'strong gas scent' started by broken 74. Beandip posted to it yesterday, and Carl and other of the 'wise ones' thoroughly addressed the suspected causes.

Nice looking 280, by the way

There are many past threads discussing this very common issue. In addition to the one mentioned above, a search using terms such as "fumes" and "exhaust" should yield lots of information.