Bash, sorry to hear about your engine failure. After reading this forum a long time ago I replaced my injector seals and eventually closed the EGR. I changed the oil recently and took the sump off to clean the strainer,not too bad in there,but after reading about your personal experience I'll always take off the sump guard when oil changing.
I flushed out the old oil which I don't normally do and after a few weeks it's the 1st time I still have green clean oil,after 50 years of changing oil in disels. I've always thought that diesel engine oil was black!
I'm on 150,000 miles now and offroad every day,I've never had a car that does everything before,I hope you stay with the 120's.
Cheers