I am a new owner of 300 and have black leather seats. The leather is reasonably supple (is that spelt rite..!!!<img src="http://www.zclub.net/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=''> but has a few crack lines. Has anyone restored their seats, know the ups and downs, What products work, and don't. Also what should I use for generally maintenance of the seats.