So when did you run amsoil?

 

I ran Amsoil in my 2004.5 2500 which I traded on my current truck.

 

So what does that have to do with the OP asking about the Amsoil CJ-4 in the 6.7? I thought you ran Amsoil in the 6.7 and had oil analysis from that??? Am I confused??

EDIT: I see you edited your original post....

 

Started running Amsoil fluids and bypass filter all the way - oil, trans, diffs, at 2k miles. Immediately picked up 1.6 hand-calculated, same exact route mpg over 10 tanks. Sent sample at 10k, told no change needed, send again at 20k. Very pleased thus far.

 

Wow 2K miles is very early to run synthetic... Cummins states not to run it earlier than 5K, and to start it anywhere from 5K-20K based on use/break-in... Thats even early by Amsoil standards.

 

I purchased the fs-2500 after much research and thought. The fs-2500 in my opinion came out to be a better overall product mainly in construction and the people I, I repeat I, would be dealing with. It does take an extra quart and a half. I started researching synthetics when I bought my 02 duramax new, Schaeffer's fit me better. So I don't bang the amsoil drum. I switched the engine to Schaeffer's 5w-40 supreme 9000 at 15,000 miles. Then at 30,000 miles I switched the differentials and the transfercase. I am still undecided about switching the tranny away from mopar. Any tranny that I have ever had anything done to it eventually failed for some reason or another. I will state that I drove gm pickups for years so it prolly was ineviteble.

 

The first oil change on my 07.5 was done @ 3,500 miles as per the overhead indicator. Now the message comes on @ 7,500 miles religiously. I ignore it and have the dealer change the oil & filter out every 10k miles with the regular CJ-4 Mopar dino oil. Have never done an oil analysis, maybe I should.
141k miles on the clock.

 

Yeah, if the computer feels your driving doesn't warrant an early change it will trip it at 7.5K, as thats the longest dodge says you can run.

 

I went 3500 my first oil change; 5000 my second; and now the dealer says go 8000 miles on the next change. He's using a low ash oil Castrol oil.