Why does engine oil turn black

So I have to change sooner. India has to go to 0. That is Ultra Low sulpher diesel. Usage of that diesel with normal engine oil will lead to additional engine wear and tear.

The most worrysome part for Diesel engine guys. When newer cars like Mercedes etc. These systems will suffer low life due to no ULSD.

This could lead to heftier service bills. So all those of you with latest merc diesels, check your engine emission norms. However LSD will ensure that your emission systems have lower life.

Its a mineral oil. I dont know about mobil 1 but I guess its CH4. The real test of fuel vs car will come next year when CBU's from abroad which confirm to American Emission standards get hit with ppm fuel instead of the 15ppm they require.

Engine oil was changed for my Fiesta TDCi yesterday as a part of the routine 10k service. When I checked the dip-stick after driving back home, the oil was black, just like before it was changed. I do know that in diesel vehicles, new engine oil goes black almost immediately as the engine is started. Why is this so? Oil shouldnt turn completely black in under kms especially since oil i assume oil filter also was changed in 10k kms car. Slight discoloration can be normal. Not all oil gets drained when the oil is drained within 20 min of car being used i.

This sometimes causes the oil to turn black almost as soon as you leave the Service shop. Please check out the oil. If it is sticky then the oil has not been changed. Next time around please insist on changing the oil 20 after the car engine is switched off.

More than waiting, ensure while the oil is drained, open the filler cap to let the air in, wait for all the oil to drain out, will take mts max. Again remove the oil filter and replace with new before you put in new oil. However, as a general rule:. Milky, foamy, or cream-colored oil can be an indicator of a head gasket leak if your exhaust is producing white smoke, or your vehicle is leaking coolant.

Simply looking right under your equipment or vehicle's oil cap should reveal if your equipment is suffering from milky or frothy oil. Typically this happens if the oil is exposed to water after raining or the equipment is not used long enough for the water on the engine to evaporate and burn off.

Thick, black, or very dark motor oil usually indicates that your oil has been exposed to dirt or dust contaminants that lead to a soot build-up. Direct injection gasoline engines produce soot over time that causes standard motor oil to turn black and thick. Soot is a byproduct of incomplete combustion and since soot particles are less than one micron in size they typically do not cause much engine wear.

The problem with soot happens when the soot particles begin to agglomerate into larger wear-causing contaminants. This is where the black thick texture may come from. It is very common for people to assume that there is a correlation between the color of oil, and the need to change the oil. Without additives, your engine will fail. With them, your oil will darken, regardless of the number of heat cycles and abrasives present.

If your engine takes synthetic oil and can go 10, miles between oil changes under normal driving conditions, then your oil is likely fine. Just as motor oil will gradually transition from amber to black, there are other signs that an oil change is necessary. Some of these signs may quite possibly point to a related problem. For instance, if the engine oil contains more than the usual trace amount of water, it will appear milky and diluted when you pull the dipstick.

Water droplets clinging to the end of the dipstick are especially problematic. This is a serious problem, one possibly caused by driving through flood waters. Next, add new oil and an oil filter, then drive your car for a few hundred miles before changing both again. Another problem to consider is oil that has a foamy or milky appearance along with a cream-like color. This is a clear sign of a head gasket leak, also confirmed by white smoke emanating from the exhaust or an increased consumption of coolant.