Yesterday I bottomed out the sump while traversing a huge pot hole.
I didn't stop to look for damage.
I should have.
Today I took my wife for a nice cruise up into the mountains. We were almost home when smoke starting pouring out from under the car and the oil light came on. I had nowhere to stop (drainage ditch on my side), so I drove for another couple of hundred meters until I could pull off. When I looked under the car oil was draining out of the bottom of the sump. The oil drain plug was missing.
I had the car flat bedded to my place and when I jacked her up I found (no surprise) that the drain plug was missing and that there was scuff marks around the sump plate.
It looks like the sump plate had taken a direct hit on the pothole and the oil drain plug had been damaged. I'm guessing that through engine vibration the plug had worked loose and eventually fallen off. Thank goodness it didn't happen when we were on the freeway (only minutes before).
Anyways, the car in up on jack stands and waiting for new oil. I'm also going to install a 'bash plate' under the sump (better late than never).
Tomorrow I start her up.
I'm not sure if the engine is damaged.
Fingers crossed.
Ron