what OIL do you use in your CUMMINS?

[trx680]

What weight oil?
What brand?
synthetic or conventional?

 

[VB712]

5w40 rotella full syn

 

[12vrunner]

15w-40 rosmella is what i use.

 

[Gump]

15-40 Amsoil and filter, changed every 15,000 or one year.

 

[Burla]

Page 381 your owners manual. Link broke, download your own for free.
On left click 2006 diesel owners manual, download and click go to page 381.

Most diesels take 15/40w. Oil Companies have to add more improvers to get the 5 rating, improvers that will be torn apart under engine load anyhow, known as shear. Less improvers means you will have a stronger base oil, much needed since your oil change interval is 15k. It appears diesels are harder on oil because it gets so dirty so fast, but it is actually the opposite, they are easier on oil then gas engines. Delvac ESP or Rotella T6 are the two most popular, I think you can get Delvac conventional at Costco so it will be cheaper, but Rotella seams to have a stronger following. Both lines have non synthetic choices, I left you the synthetic versions. Get synthetic filters like Amsoil, even better look into a bypass kit, changes your oil change interval drastically. Use Synthetic oil and filter, double the time you need to change your oil.

In before the move? I can only assume the OP is talking about a 2006, but same thing applies to most all diesels. CA additions are completely different, but I think they stopped making them by 2006, even a couple years earlier.

 

[69GWC]

I always ran 15/40 Rotella as well.

 

[SyN]

I sold my 2001 F250 7.3L PSD to my sons best friend 18 months ago with 298k miles on her 1/2 her life running Rotella T6 5W-40! It was a miracle worker in the winter months & added amazing protection in the hot summer months!

She now has 326k miles & still running with T6! It is decently price & is available around every corner it seems!

I highly recommend The T6 for Any diesel motor!

Shell Rotella (550019921) T6 5W-40 Full Synthetic, Heavy Duty Diesel Engine Oil (CJ-4) - 1 Gallon https://www.amazon.com/dp/B005CHT4W6/ref=cm_sw_r_cp_api_aZQCybNEPXDPE

If I was ever to trade my 5.7L in on a 6.7L this would be my oil of choice.

 

[JRG18]

Have been running Rotella T6 full synth but am switching to Rotella T5 synthetic blend 15w40 next change. Change it every 6 months regardless of miles as per the manual. Next week marks a year of ownership and I've put on 9500 miles is all.