- Local time
- 3:50 AM
- User ID
- 2014
- Joined
- Oct 21, 2016
- Messages
- 34,548
- Reaction score
- 146,875
- Location
- Kansas

I doubt oil change interval caused it.
I did find part of the sodium filled valve stem down the exhaust pipe against the converter
View attachment 161295
That takes some talent.
What vehicle is this again?