I work in an AG repair shop, and it is common place for us to do
this prior to tearing down a gag engine. Just makes things cleaner & easyer to see. Guess that in itself answerd your question. Yes i tdoes work.
How I do it: Start engine & get up to normal op. temp.
Drain old oil & put 75% diesel / 25% 30 wt non detegent oil in.
run at idle for 3 minuts. Drain. Ta-da! Clean engine.
The WORST case I had ever done was on my own truck. A 1988 K1500 w. 305. It took 3 flushes to get all the sludge out of the engine! Evidently, the previous owner did not think it nessisary to change the oil very often!!!!
