DarbyWalters wrote:
oldnavy wrote:
I think there may be some minor miss info here DW.
1. Shell website site state only 10% to 15% price differential.
I wonder where the miss info is? The 20%-30% was a real number from a survey of large fleet services. They have had the CJ-4 since May. They could get it in bulk...quart and gallon sizes supposedly available on Oct.15th 2006. Maybe by the time the quart/gallon sizes are made available, the prices will be closer to 15% to 20%, but the way things are going...I doubt it will be cheaper
As for a simple way to formulate oils to meet the CJ-4 ratings...lower sulfate of ash is a parameter and the low TBN of 8+/- 1 is a parameter or result (whichever way you want to look at it). They have to start with a higher grade/price Group II base stock to meet this requirement. They do have to add an additive package to supplement the low TBN to get the longevity properties of a 12TBN+/- CI-4+/CI-4.
As for our use, I hope this info helps CRD Owners make an educated decision in thier choice of oil. I think any opil that meets the CI-4+/CI-4 will do just fine in the CRD. I prefer the oils with a higher TBN of 12 or better. With no DPF to worry about, a CJ-4 is not really needed for our CRDs.
Diesel Particulate Filter(DPF)...basically a "cooker" in the exhaust that operate at high temperatures ( I believe around 1300 degrees ) that burns the Particulate Matter(PM) in the exhaust emmisions. Like OldNavy stated, it is too handle the soot that remains in the exhaust before it exits the tailpipe.
***Just an Opinion*** I am a big fan of Amsoil. Since it is a true syntheticly engineered oil, it can have excellent wear/sheer/volitiliy/pour/flash properties engineered into it's formula.
There will be a lot of misinfo for awhile if nothing else from some poor smuck typing in the info for the engineers or websites. Mobil is having that problem at the present. M 1 0w-40 oil is not being labeled A3 for the high temp shear strength now (I have looked at some new bottles) for some reason and website says it is still ACEA A3 as does the tech line. So who knows????
Remember being synthetic base Group IV does not automaticly that it is a high temp shear strength oil, Mobil and Amsoil to mention only a few, has quite a few full synthetic Group IV oils that do not meet that standard and are not recommended in Chain Driven OHC engines, gas or diesel.
There also seems to be some mistaken idea that this CJ-4 plus oil can only be made from Group II or Group III non synthetic base stocks (I sometimes use the out dated term class here atv the forum) which is not true. It will actually be a little easier to make the Group IV oils CJ-4 plus then a Group II oil. The reason for the big deal with the 15w-40 non synthetic Group II oils like Delvac 1300 and the Shell 15w-40 is that this is the oils going into the big diesels and that is a
MUCH, MUCH LARGER MARKET then small auto and light duty PU truck market. We will be hearing more about the new CJ-4 oils shortly as the oil mfg's start reformulating their diesel oils for car & PU truck market. You will most likely not see a 15w-40 CJ-4+ oil made for, or recommended by auto mfg's, they will be using 0w-40 or 5w-40 oils to aid in cold starts and MPG's and that seems to be almost an EPA mandate from my research and that does make sense to me. Now that said the Group II CJ 15w-40 oil is still an excellent oil for the CRD and if I was doing mostly highway miles in our CRD I would have no problem using the 15w-40 CJ over the Group IV 5w-40 CJ oil If I could get it cheaper.
One thing to always remember here is: synthetic oil always start off as what ever the max number is on a multigrade oil,
Group IV (synthetic oil) such as a 0w-40 oil is actually a 40w oil with additive package to help it achieve the 0w rating.
Group I, II, III oils (non synthetic oils) always start with the lowest number for base stock, so a 5w-40 in that oil, like Delvac 1300 5w-40 oil starts out as a 5w oil and has an additive package that helps it achieve the 40w rating.
As for pricing goes I will assume that we the customer will take it in the short's as usual from the oil company's.
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