Not Good.
"Engine test results show that a 200:1 blend of 2-stroke oil in diesel results in a 2% loss of engine power in a 16 hour test due to injector fouling, a risk that would apply to any common rail diesel engine, but could also worsen fouling in older engines."
https://www.rmi.org.za/news/2-stroke-oil-in-diesel-a-technical-study/
"Engine test results show that a 200:1 blend of 2-stroke oil in diesel results in a 2% loss of engine power in a 16 hour test due to injector fouling, a risk that would apply to any common rail diesel engine, but could also worsen fouling in older engines."
https://www.rmi.org.za/news/2-stroke-oil-in-diesel-a-technical-study/