being new to the forum today, i'm learning a lot. i read a post about 560SEL timing chain guides. I assume this would also apply to the 420SEL? when started cold, if the temp outside is chilly, i'll get noise for a few seconds, up to a few minutes. typically slapping the throttle quickly stops it. i went with a lighter weight oil, which helped, but if there's a real fix, i need to do it. I do all my own work, is this a difficult job? not too familiar with working on the Benz yet, always worked on American stuff. Although the benz hasn't required much work, thank god.