Ok, here’s the update:
* It did have oil, albeit low considering it was changed a week earlier. No detected leaks.
* coolant was also a tad low, but I hadn’t checked that in a while, so unsure.
* normal cold start exhaust, and we didn’t get the same burning smell - or cloud — this time, so we couldn’t reproduce the issues that caused alarm. Could smell some coolant, but it went away after a bit of driving.
all we could think is that the change loosened up some gunk, and the three-day sit and then start combusted it, though we did another start the next day and got same.
not sure what to think except to watch it, otherwise we only topped the oil and coolant. At 80k, head gasket should be fine for a while …
I
How much oil was drained ? (Before they topped it off)