Joe Romas wrote:
Old Navy
Do you suppose they're hoping by eliminating the sulpher the soot will be go away and the oil won't be a problem? Also what oil are you using? Since getting the factory "water" out of there and puting in Rotella 5-40 I don't see near the vapor under the oil cap as I did. Do they have the soot/oil build up in Europe on EGR diesels like we do here
Joe I hate to whack you up side your head but it is not about the precieved thin oil used in CRD.
In a mineral based oil, the only thing that flows like a 10W at cold temps IS a 10W. Thus when a 5W-40 is made, one begins with a 20,000 gallon vat of 5W oil then you add VI improvers (plastic coil springs) which expand when heated, shrink when cooled. Thus the 5W oil has the viscosity of a 40W at operational temps, a 5W when cooled.
With a full synthetic Group IV or group V oil, we can actually start out with a 40W base stock as synthetic oils do not thicken with cold temps (nor do they thin as much as mineral based oils with heat). So, a 40W base stock may meet the cold flow characteristics of a 5W, even a 0W, thus enabling the 0W-40 API rating. Thus contrary to the old wive's tale, (that synthetics are 'thin' and thus leak) most synthetic oils are actually thicker than their mineral based equivalents.
They volitilty of these oils, including the class III non synthetic oils have additives that can help alter the ability of the oil to not vaporize as easily, the Mobil 0w-40 has a lower volitily the Mobil 1 5w-40 by design as it is an older oil and the engines it was designed to protect didn't need that amount of protection. Same applies to the soot carrying ability of the Mobil 1 0w-40 oil, it wasn't needed to have the soot carrying ability the Mobil 1 5w-40 that was designed for a higher soot engine using 500 ppm fuel compaired European average of 50 ppm average.
The Rotella T Synthetic oil is a trade name, it is a class III oil, just as most other good (non synthetic oils) class III oils you can buy off the shelf. The term synthetic was rulled a trade name in a suit by Mobil Oil against Castrol calling their class III oil a synthetic oil about 10 years ago when Mobil lost the case. Following this rulling many others jumped on the synthetic oil band wagon for higher proffit margins, and suddenly you saw every brand under the sun come to the shelves in local auto store and Wally-World. This court rulling has gone unnoticed by most of the general population including lower levels of the auto repair world such as you local tec who works on your car, but believe me the auto mfg's know about the rulling and the differences. That is why they have in some cases (Ford, MB or VW for example) developed very specfic standards requirring test to meet those standards. In some cases the individual engine design can require a very different oil for what seems to some people just another engine. If you have any doubts about the Class I, II, III, IV oils feel free to do the Google or contact the lab that did your oil testing. You have done an oil sample test haven't you? I seem to remembered you doing one but I could be mistaken.
Ok I am off the stand about oils.
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