I know this topic has been mentioned before in the past - but im intrigued into doing this myself on my 2.5 V6 TDi engine. I believe diesel fuel mixtures have changed over the past few years due to trying to make them more environmentally friendly, from what I have read this has reduced the lubricity of the diesel. Up until this point I have used Millers fuel additive with the diesel I use (usually BP regular diesel) just for peace of mind - but its all probably placebo?... maybe? Now I have finished the bottle of Millers, I am tempted to try using 2-stroke oil in with the diesel. I believe 2-stroke oil is designed to help keep 2-stroke engines clean, im guessing it may have the same effects with diesel engines, especially those with EGR valves. Is anyone using 2-stroke currently? I am interested to hear what a few of the diesel tuners on here think.