oil is black immediately after oil change

[Marajin]

first of all,.. a bypass oil filter WILL NOT keep your oil from changing to black in color.


SOOT is the number one cause of black oil in a diesel engine.


ALL older engines that have fixed-vane turbochargers on them produce enough soot to keep the oil black. This is normal.

ALL newer engines with Variable Geometry Turbo's are perfectly capable of being adjusted so that the engine does not produce soot any more (as long as the engine is in good shape) but there is a problem. That problem is that these same engines are required to have emissions control, EGR, etc. on them, and it is the EGR system and Emissions tuning that makes excess soot and keeps the oil black.


If you want clean oil, like in many of the trucks I have seen,.. The only way to achieve it is to have it custom tuned by someone who is very very good at it!.

The engine oil does not lie!. It is extremely difficult to get a diesel engine to have perfectly clean oil after 15,000 miles or so, but it is very do-able. It does not take special filters, bypass filters, or anything else to try to remove it. It takes an engine with a Variable Geometry Turbo, and some really good custom tuning to both the the engine AND the turbo. Removing the EGR or so-called "Mandate" itself is NOT ENOUGH to achieve this, though it is one of the steps typically necessary.


If you want clean oil (roughly same color as the bottle) after 15,000 miles in a class-8 diesel engine, here is what it typically takes...

* the engine running very well already with no significant intake or exhaust manifold leaks. This means the fuel mileage will usually be very high too.

* The "Mandate" likely removed.

* A Variable Geometry Turbo that has been very well mapped.

* Really good custom tuning in the ECM. -- So far, there are only 3 people known to be capable of tuning an ECM on this level (soon to be 4). They are all participants on this forum as well.

* Having the power level in the engine set to something reasonable, like 575 horsepower or less.

* The driver not idling the truck for extended periods of time.

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Preacherboy, in your case, if you are not idling your truck and it is still turning black,.. Then you still have something wrong with either your engine, or its programming. I have seen a lot of CM870 engines with clean oil.

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The benefits of having perfectly clean oil in the engine all the time are huge. It is well known by now that a CM870/CM871 will yield about 40% less wear in most of its components when set this way.