Removed original valve covers to replace with new and was shocked to see the condition of the timing chains done 200K miles...they appear as new and perfectly snug. Entire valve train and cams look perfect too. Thanks perhaps to 5K oil change intervals.

 

for science, of course, what oil did you primarily use?

 

Whilst in warranty, main dealer supplied Castrol 5W20 after expiry switched to Pennzoil Ultra Platinum 5W20.