I've have yet another question for all you diesel experts out there. When the weather is warm, my truck has no problems starting in the morning. However, this morning it was a little chilly and i noticed my truck didn't turn over quite as quickley and it smoked a lot more than normal. I figured the smoke was just unburned fuel from trying to start it. I'm just wondering if i should wait until the fall to get new glow plugs and extend the life of these, since its almost summer and it won't be getting too cold for a little while, or jump on a few new ones for the summer?  

Put new ones in, your glow plug timer and starter will thank you. Your right about the unburned fuel smoke those are the cylinders with dead glow plugs not firing. I would bet if you lost one more glow plug your truck won't start at all.  

i just replaced the glow plugs in my powerstroke about a month ago, i tested them as i replaced them and all eight were burnt out. the truck wouldnt crank unless it was pluged in or was warm before i replaced them.  

YOU COULD ALSO USE 10W30 DIESEL OIL IN THE WINTER IF YOU DONT ALREADY.