Hmm...sounds a bit of a First World Problem, TBH
Aside from the engine noises suggested, could it be a loose screw, nut or even stone in a hollow section somewhere?. Lots of these on a car, though admittedly hard to see how cold weather would influence that, unless it made a cavity wax treatment less sticky..
This could MAYBE be addressed by rust proofing with something like Waxoyl which, like fluid checking, is probably a good thng to do anyway and might stick it in place.
If you want to track it down, an electronic stethoscope might be useful. Heres a DIY version in use to detect detonation.
www.autospeed.com/a_0353/page1
The hearing aid from which it is derived my no longer be available, but you could perhaps locate an equivalent, build from scratch as outlined, in the article or (at still greater cost) buy an off-the-shelf pro version..
Getting a pro to track it down would seem to be an especially unproductive way of disposing of money
Edited by edlithgow on 24/02/2023 at 04:29
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