I know better than to start a lube thread, (sorry, really, I am!)
Amsoil is selling this now:
Snipped from amsoil.com
"AMSOIL Synthetic 5W-40 Premium Diesel Oil (DEO) is the premium choice diesel oil for model year 2007 and newer heavy-duty and pickup truck diesel engines requiring API CJ-4 emission quality oil standards."

My question: What makes the 07 oil different from the previous OR (simpler) will this oil suffice for the older gen1/2/3 cummins'?

Thanks

Andy

 

I have had it in for about 1k or 2k miles and it is good I can't complain. I noticed that the cold starts are way better. Yesterday I didn't plug it in and it was about 30 degrees and didn't hesitate. It warms up faster and my milage is 17-18 and that is avg of 50 mph around town and such. Adios

 

All API licensed oils are backward compatible by design.

With the new Cummins valvetrain tests for 2007, Chevron, Texaco, Valvoline and others were way out front in getting the tests performed and verified by independent test labs across the country.

The camshaft and crossheads have always been the highest wearing item in the ISB. Cummins has known this, of course. The new ISB 350 hour test is pretty grueling. Some of the first tests by labs were getting different results with the same tests and oils, but problem in testing was discovered early on and new schedules and so on were developed.

All the big guys had their formulas tested and certified by Oct 15th with the API.

A reduction is ash content and the alkalinity of the oil were a major change.

Lubrizol once again played a big part, as did API, SWRI and other testing facilities.

I have seen the tappets and camshafts after the 350 hour tests gone wrong. Some look nasty. Thats over 14 days on an engine dyno running 24 hours. The CAT ring test takes a month. LOL

Something like 20 million is test dollars was spent getting the program done