I sent my first oil sample out today, from the change I did yesterday at 97K miles. I've runn a PS/MMO mixture until that famous test came out a while back - and have been running a quart of 2stroke every tank since then. Well see how it looks. I normally change at 5K, but went 7K this time on Valvoline Premium Blue. I used Rotella for the first 30 or 40K.

I'm anxious to see how she's holding up. I should see if the intermittent rough idle is an injector sticking open or something like that I hope.

 

I'll be watching this thread. Did you use the PB CJ formulation? I normally run that oil to 4,000 or so since it's CJ so I would like to see your Results with 7,000!

 

I still don't understand why so many waste money using 2 cycle oil in there fuel being they don't have a V44 pump to worry about.

 

One oil sample will not be totally conclusive, just in case you get some sort of minor alarm. I have been sending in a sample before every oil for a over year now. What alarmed me a while back was it a sample came up with high potassium. That problem taught me to always take a sample not only the same way but at the same oil usage. I draw a sample after 4k miles on the oil now so there is a better sample that is compairable to the past. There is some differences in my samples but nothing way off, 49k on the motor and so far so good.
To make a long story short....
When I first got the truck I sent in a few samples that did not show anything bad so I didn't bother doing much sampling. then at 13k miles, the piston rod bearing went out and the whole motor was rebuilt ( under warranty). A year later and 25k on the motor I sent in a sample and it came up with potassium which at it's highest was 39 ppm. The high levels indicates a possible antifreeze leak . So I sent in samples more often to see if certain things increased or decreased with higher miles. Eventually with consistant sampling every oil change the levels became more consistant and the alarms faded away. It is a good piece of mind for mind me and waste of time and $ for others. I hope it comes up good for you.

 

I'm not really concerned, but I do have a little nagging worry because I'm about to roll out of warranty on the most expensive motor I've ever depended on. This is my first diesel, and I hate going past 3,000 miles on oil. So I was doing 5,000 intervals. I just really want to know that I'm not doing damage if I'm a little late on my interval . . . or if I'm wasting my money and should be doing it at 10,000. It's more of a gut check than anything else really, I guess.

 

Because there is very little Lubricity in this new diesel. There are several post that go into diesel fuel. Treated and Untreated diesel. The new ULSD 15ppm which I am sure you know. Just because it is not a VP44 pump, doesn't mean that our CP3's don't need lubricating. The diesel fuel lubricity is what keeps our pumps running. There are several post on that as well.

 

So what your saying is, cummins built a motor that won't work with the new diesel...or better yet the fuel companies now produce a diesel fuel that will ruin our motors....

I'm not saying your wrong but it's kinda hard for me to believe that this would be true. If it was don't you think that car companies would put a bulletin to consumers telling them to be sure and add some kind of additive so they don't get a butt load of warranty claims??

I've had 5 different diesels, 3 cummins, 2 fords and never used fuel treatment and never had any engine problems.

 

7k? Thats it? Do you tow heavy? IIRC, schedule A in the manual says you can go 15k on conventional oil between oil changes, if you are not towing all the time. I have about 15k on my last Amsoil oil change, and am going to do an oil sample shortly, but I have no doubts I will be able to go 25k miles with no problem between changes.
Scott

 

Where has anyone stated that the CP3 gets its lube from diesel fuel thus we all need to add extra to keep it running? I have never read a post from anyone stating their CP3 went out do to lack of lube in diesel fuel! Its been talked to death but the only ones who had to worry about lube are those who have/had V44 pumps as when they first started making ULSD they were not sure how much lube was needed in diesel at that time, but that has now been taken care of to the best of my knowledge.

 

Well, I may have stated that wrong. I do realize that the CP3 does not require any lubrication from the diesel fuel. Its just things tend to run smoother with lubricity. And with the ULSD, why not try and get your mileage back out of the additive due to the poor lubricity of the ULSD? Your keeping injectors clean in the process as well. Why not add a lubricity?

 

How else in holy heck is the cp3 gonna being cooled and lubed? There are no oil lines feeding it are there?????

Of course it's the diesel fuel doing the job... come on... common sense.

 

Well, I said earlier that the CP3 is lubricated by the fuel, then I am told thats not correct. So then I post its NOT and then I am told that it is. I can't win so I might as well just agree with everyones comments. DBLR-its not lubricated by fuel. trik396-it is lubricated by the fuel. Now everyones happy.... well, except for me. lol

 

DBLR.. If there was no fuel running through the pump, how would it stay lubricated? I guess I don't know any other way. Please let me know.

 

How about a compromise? It's not lubricated by the diesel fuel, but rather it is COOLED by the diesel fuel??

 

How about that oil sample?