Bottom line on Oil Change Intervals

[DUBLR]

My 03 calls for oil change intervals of 7,500 miles for severe duty, 15,000 for light. I tow part time so I have changed faithfully at 10,000. I run Delo 400 and have in over the road diesels for 30 years…. no engine failures…. . very high miles. My oil stays pretty clean up to 8,000 miles. With this new low emission oil, will my change interval’s lower? I am ready to crack open a fresh case of Delo 400 Low Emissions and debating if to return. In that case I would switch to Shell Rotella or Valvoline Blue…. if I can find it. I will change to Rotella if I can stay with the 10,000 mile change but I think it is all the same stuff now (CJ-4) I have not figured out all the press on this yet. We are still humming nicely at about 120,000 miles. I intend to do an oil analysis to determine oil life of the new stuff but I don’t want to extend too far. Comments?

 

[NLeach]

they 7500 interval was for CI oil not the CJ they have out now. I keeping hearing all this bad stuff about the CJ oils but some have done an oil analysis and have had good results. If you change it before the 7500 miles I think either would work,I change mine at 3000 and I have been using the valvoline cj 15w40,no issues that I can tell of. I think if you want to run extended oil changes then maybe the cj wont work that good for you. Eventually all the oils will be cj,just a matter of time.

 

[pwr2tow]

Just my take on this CJ vs CI oil stuff.
If the CJ oil is good for the new 6. 7 engine with all the emission junk and engine oil loading crap as a by product how can it be worse for the friendly 5. 9 engine. There is alot more to modern day oils than TBN numbers. Engine oil company blended additives make up a big part of oil longivity. Even synthetics recognize the importance of additives in oil.

 

[Gary - K7GLD]

Long haul, open road driving, puts lots less stress on engine lube additives than the short haul, stop and go around town driving. It's the additive package that seems to have been somewhat weakened in the latest CJ oils, to conform to EPA and exhaust system warranty issues. You just have to determine where YOUR operation falls in that scenario - and then choose accordingly... :-laf

 

[pwr2tow]

That's odd, if you look at the spider web graph from amsoil for CJ oils in issue 58 of the TDR it shows the additive package is better.

If your going to drive 7500 miles of stop and go driving I'ed be changing oil every 3,000 miles. The 7500 mile change schedule in your owners manual takes into account all types of driving, not just all miles on one type.

 

[GaryOwen]

I run mostly highway miles, half of which is towing. Been using Shell Rotella CJ for over 150k miles now, and oil analysis results are similar to what I was getting with CI oil. TBN numbers run a little lower on the CJ oils, but is still plenty high. Had been changing at 10k intervals, but last sample was at 12k and still looked good (TBN=6. 6). Blackstone recommended maintaining 12k mile intervals.



You might want to sample at 6 or 8k miles and see what you get. Have heard that CJ will clean out engine somewhat, so iron and some other readings may be higher for a few changes.



Gary

 

[DUBLR]

Great input guys..... I have what I need. CJ is CJ I'm afraid.