Yes I have always ran the 0-40 synthetic winter and summer. Never had a issue with temps while pulling even in kelowna at plus 30 Also run the Mobil 1 and before that the xd3 which is the same oil, between myself and my old man we have over 1200000kms on the oil between 5 trucks neither one of us have had 1 motor issue
1 99 7.3 sold at 450k dads
1 07 6.0L sold at350k dads
2 6.4's 08 traded at 200k 2010 at 80k and will be around for a long time. Mine
1 11 6.7 At. 180k dads.
Since you get it free 3500 O/c is nice I run mine to 12000Kms