I don't think this is an issue on the 4.2.that is interesting
i have a 2008 full-size supercharged with 232K mi
i did the full chain/tensioner/guide install about 2K mi ago
motor had a nasty rattle at start up for about last 50K mi
now after replacement its quiet
worth it to me because got so many strange looks and comments when started the car before and just didn't sound like was prolonging life of anything mechanical
thanks for posting
Interesting. The BMW M62tu's had a similar issue with their stock tensioner design, hence the updated tensioner with a longer, stiffer spring to keep more tension on the chain at all times, even with low oil pressure on startup.very interesting... so if I'm reading that right the root of the issue isn't so much with the guides/chain as everyone assumes, but with this hydraulic tensioner that fails leaving the chain slack @ temp causing the actual damage?