emh3090
SDD Junior Member
Ok I need a little help.... I have a 05' 6.0 w/ 54,000 miles on it. I just did my first oil change since I have had the truck. I was running Rotella 15W40 with a wix filter and went to a Goodrich filter with Mobil Delvac 15W40, since this is what we use in our trucks at work. I had no issues of no start in cold weather prior to changing the oil. Now, if the truck sits for extended time in temps around 40 degrees, the engine will not start. If I plug the block heater in and let it warm up for about an hour, the truck will start fine and run normal after warming up. Is this most likely a result of using a thicker oil than the synthetic Rotella causing the stiction issue with the injectors? I am headed out of town this week and am thinking I will change the oil back to rotella with the wix filter since that was working to begin with. Any suggestions?