Is there anyone out there that has used or has an opinion about the Rotella Synthetic? I have a stock '01 QC that I will be pulling a 16' enclosed trailer with mowers in it this spring and summer and with 60,000 (I know not even broken in yet) I thought this might be a good switch. My Battalion Chief switched to it in his GM 6. 5 (he also owns a '03 3500 ctd) and said it started the other morning like it does in the summer. It has been a little cold here recently and his 6. 5 is cold natured. I was raised on Rotella and use 15W40 now and have not had a lick of trouble but I'm also thinking of adding an Edge Ez for the towing aspects to try and get the best performance I can. Any thoughts on my ramblings would be appreciated. :--)