What motor oil do you use and why?
What motor oil do you use and why?
I use Shell synthetic in my Duramax because of the 7500-mile drain interval and how clean the oil remains over the time it's there. And, it's available at WalMart. I might use Mobil Delvac 1 synthetic, but it's much harder to find.
For a 6.5, I tend to use Chevron Delo because of the 3K drain intervals and the soot load.
Jim
Shell Rotella Line used here
The 95 GMC gets Rotella T6 5W-40 synthetic, also running an Amsoil bypass filter. I run 10-12K oil change intervals, but change the PF1218 spin on every 2500 miles and add a quart.
Have been running RotellaT 15W-40 in the 2005 Dmax and 7500 mile change intervals. EGR disabled since new, oil stays clean, starting to discolor when changed at 7500 miles. Also run with the turbo vanes open during light cruise which also reduces soot in the oil.