Yesterday I was in the 'training shop' at work - did a brake job on a colleagues car (2016-ish Accord Coupe) with an audience of new recruits to the automotive office team, helps if the support folks can at least visualize what a brake rotor is.
While I was there and had access to a warm shop, lift, etc I did an oil change on the DTS....Only 3000km on it in the last year (thanks WFH), oil monitor was still showing 84% life, but I've been keeping it on an annual change schedule anyway. Been running Penzoil Ultra Synthetic for the last few changes, which goes on sale for about $45 a jug (DTS takes 2 jugs)....Another $15 for a filter and you're over $100 for an oil change, and doing the work yourself.