My truck has for almost as long as i have had it, blown some white smoke. At idle it doesn't that i can see, but when it just starts up it blows a lot of white, but it smells like fuel, burns my eyes. No sweet smell or smell like antifreeze. When i take off, even when its warm, it will blow black when i really get on it, or shift through the gears but anything over idle when driving it seems to blow white, or possibly gray. Anyways, i ran it a little low on oil once, i think i was about 5 quarts low or so. Also, when it start it up, it has a knocking, or ticking noise, almost in between. Maybe its out of time, or maybe its just me and these old idi's sound like that. But when its at idle and i raise the rpms a little, it goes away, and almost comes back at a higher rpm. Other than that, runs great. The glow plugs don't work now, so i start it with ether a little. Glow plugs come tomorrow hopefully. So i dont know if it starts hard. when its warm though, it starts right up and the truck runs great otherwise. any ideas?