I have a 3500 HO 6sp SWB QC on order, and am investigating sources for motor oil. I am the type that changes oil every 3000 miles, so when I get my CTD, I'll likely shorten the intervals from what Cummins recommends.
I see lots of discussion here about Rotella, which seems to be the most popular, and some mention of Delo and Delvac. Premium Blue is no longer carried by Wal-Mart. Today I noticed that Wal-Mart carries Pennzoil® Long-Life® Heavy Duty Engine Oil. Does anyone have any experience with Pennzoil, or is there a source for test results?
I see lots of discussion here about Rotella, which seems to be the most popular, and some mention of Delo and Delvac. Premium Blue is no longer carried by Wal-Mart. Today I noticed that Wal-Mart carries Pennzoil® Long-Life® Heavy Duty Engine Oil. Does anyone have any experience with Pennzoil, or is there a source for test results?