2UZ FE oil change mishap. Just how tough are these engines?

[dahoseman]

hope the visc. was 5/30. Why synthetics since 5k refill intervals are the norm and a high quality non-synth. Will do just fine.

First thread. Hi folks.

My vehicle is a 2008 GX470 with 230,000 miles. It's recently acquired but I know the previous owners and have a good idea of the maintenance that's been done and the sort of use it's been subjected to (grocery getting, highway trips, etc. no offroading, no towing, barely any snow, etc)

That does it for the introduction for now. I'm creating this thread because we recently had an oil change mishap where the GX was idled for 90-120 seconds without oil (none in the pan, none in the filter). The engine was cold. The accelerator was never pressed. The "old" oil that had been drained was 20k mile synthetic that had 5k miles (still looked new).

I'm inviting speculation, advice, comparative stories, etc. I'm sure there's damage done, and that it's probably not immediately quantifiable. If nothing else I can at least document if any issues pop up, if oil consumption starts, etc.

What I've observed since the incident with 60 (non highway) miles driven:

I don't believe the engine is ticking any louder than it was previously, and neither does the previous owner. With a stethoscope I can hear the ticking at the spark coils (they all sound pretty much the same, no outliers) and nothing at the valve cover.
The MPG hasn't suffered(getting 18-19 with soft driving).
No oil smoke, engine lights, or issues with engine power.
Oil level hasn't moved on the dipstick. (Oil level usually does not noticeably decrease between changes)
Also, I'm thinking of getting an oil analysis.

What do y'all say?

If it wasn’t fine, it wouldn’t be fine.

If you ever want to see things taken to the limit, go to an old-school VW meetup. They specifically blow up an engine for raffle tickets based on time to detonate. They take an old “busted” VW bug engine that someone donated, put it on a stand with a fuel hose into a gas can, pull the oil plug and let ‘er rip at wide open throttle until it disintegrates. I have been at meets in which the engine ran screaming until it ran out of gas and they had to refill the can. At one event where an engine ran through the second can of gas and they were getting bored, the gas guy brought a bucket of sand after tank #2 ran out he and put a few scoops of sand into the intake to speed up the process.

Obviously, our engines are ‘slightly’ more sophisticated than a VW bug, but an engine will let you know when it is unhappy.