Run 100 percent in one tank, diesel mix in the other, the mix varies with the number of returns of WMO in the tank, but it's around 50 percent. My truck WILL NOT start without a splash of gasoline, or a shot of ether if i leave it on oil and it has time to cool significantly. I am very forgetful, and often leave the truck on oil. I have a reman orielly's starter on there that is 4 months old and is showing signs of complaint already. It takes me about 15 minutes to change that starter, so no biggie. I bought the autolite glowplugs against advice on this forum, and they literally didn't last 2 months. With good glowplugs I can start on 100 percent oil with an ambient temperature engine in the 60's and high 50's Without good glowplugs with mid south temperatures in the high 80's, and 90's I can't even start on Diesel without excessive cranking. BUT my truck is also showing signs of failing injectors. The injectors are nearing 400,000.