What motor oil do you use and why?

[More Power]

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

[jhornsby3]

I use the Rotella full synthetic. It has quieted the rattle some. I got another 1+ MPG. It's cheap at the Wallies. And I read a report by a independant oil analyzing firm that said that is the best full synthetic on the market for the light duty diesel engine. That it beats the requirements by a long shot. I'd post the report but I have changed computers twice now since I saved it.

[ToddMeister]

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.

[Mark Rinker]

Mobil Delvac black jug - 10K intervals

[rustyk]

Rotella T 15W40 mineral, 4-5K mile drain interval (8T motorhome loads the engine a lot more than a pickup or Suburban). I was a field engineer with Shell many years ago. I may consider switching to synthetic due to ULSD, but haven't seen a convincing study about the effect of ULSD.

[greatwhite]

Rotella T6 synthetic.

5W40.

Yup, I drank the cool aid:

http://www-static.shell.com/static/c...rotella_t6.pdf

[Low_Bridge]

Are there any straight weight synthetics? The previous owner was using a Shell Rotella T5 synthetic blend. I've got about 300+ miles on the truck since I bought it & she does no seem to have much if any blow by. Unknown actual engine mileage. Have I gotten the impression that switching between full synthetic & conventional is a non issue? I have always run Rotella T1 in both my gas & diesels but being out of the loop thought I'd get some more input ~

Thanks!

[spongebob]

Amsoil, I have 408,000 miles on the cock.

[DmaxMaverick]

Amsoil, I have 408,000 miles on the cock.

My chickens NEVER went that far. Impressive.

[EdHale]

I feel like a beginner with only 217,000 on my '06 LBZ.