Loving the speculation!
Jacked her up, took her cover off, and had a look up her skirt. And the problem was....nothing. Saw that one coming. Strut mounts, sway mounts, engine mounts, end links, essentially every bolt I could find under there was a-OK. Oil drain plug was where it should be. I keep the A/C compressor off with the cool temps as the accessory fan makes the oil cooler overly effective during the fall/winter/spring.
Either I'm hearing things or this issue will present itself later. Regardless, I'm going to add some Whiteline end links to my spring to-do list.
I'll revive this thread from the dead sometime down the road if I ever locate the issue. Thanks to everyone for their input.
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2013 Cadillac V-Wagon, RIP Z
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