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Mar
Oil can be very very dark blackeven and still be effective. Stay away from the oil additives if you run a good oil rotella- mobil -delo there is no reason for any additive.
Change the oil and run that tank.
Why does diesel oil turn black. High Compression Diesel Engine Designs Cause Diesel Engine Oils to Turn Black. Most modern diesel engines use high compression to optimize torque and horsepower efficiencies and minimize emissions. While the diesel fuel is compressed during the engines internal combustion process more piston ring blow-by occurs.
It is normal for diesel motor oil to turn black quickly. The dark color is a sign that the oil is performing correctly by keeping byproducts of the combustion process in suspension. The oil is turning black because it is cleaning the soot out of the engine.
Oil has 3 functions in any engine Cool Clean and Lubricate. Stay away from the oil additives if you run a good oil rotella- mobil -delo there is no reason for any additive. If your diesel oil goes black quickly after an oil change then quite clearly the engine is definitely not clean and likely to be contaminated with soot and sludgy deposits.
This can even happen on low mileage vehicles. Many customers religiously change their oil strictly on schedule and wonder why theirs still go dirty straight after an oil change. There are probably too many.
The diesel oil fuel burning produces carbon soot carbon black that contaminates the diesel oil lubricant and makes it look black rather quickly. Carbon black is good at reducing friction so it is not a problem. Some oils have carbon black added.
The oil in your engine is there for three main reasons to lubricate the moving metal parts reducing friction to help in cooling by transferring the heat from the metal components to the sump and to clean the engine of the carbon deposits that can hinder performance. It is the latter that is behind your oil turning black. Is your car a diesel.
In diesels oil tends to turn black quite early the oil changes colour as it retains or traps the oil which is oxidised and also component wear soot etc if its black means its retaining properties are good and oil is doing its job. New diesel oil will turn black if the engine was designed in such a way that it has a significant amount of residual oil. Obviously if that oil was well used it will turn the new oil black.
Answer 1 of 4. Well it doesnt start out black BUT although black oil in a petrol engine is DEFINITIVELY past high time to change it the rules are very different in diesel engines. Even if you have a diesel engine with a VERY low mileage AND has had a new filter and new oil.
This thread has been very helpful. Just bought my first diesel car and although only done 15000 miles and 3000 since the last oil change the oil is very black. Was shocked at first as all my previous cars were petrol and oil was always light brown.
I did think the dealership had lied to me but it seems black oil in a diesel engine is the norm. While heat cycles cause oil to darken soot causes oil to turn black. Most people associate soot with diesel engines but gasoline engines can produce soot as well particularly modern gasoline-direct-injection engines.
Soot is a byproduct of incomplete combustion. The oil turning black means the oil is cleaning the soot and carbon out of the inside of the engine. So if its not turning black that means you have a very clean engine you have a tightly sealed engine with very little blowby or both.
The only thing I can think of is engine oil getting into the oil but I dont know how it can unless you have an issue with the cylinder head or gasket. As a standard rule we ask for the year of the truck and what mods you have. Also any recent work done to the truck.
Run the tank down low. Change the oil and run that tank. Tiny metal particles from engine parts will break free and circulate in the oil.
The dust and dirt kicked up from the road and not trapped by the oil filter is another contributor to the oils darkening process. Engine oil also includes additives chemical compounds designed to improve lubricant performance. Why Does Diesel Oil Turn Black.
Why Is Diesel Oil So Dark. It is the oil doing its job suspending the soot. My Jetta will turn the fresh oil black as soon as you crank it.
Does your dads 03 have the EGR blocked. That could keep the oil lighter for longer. Do you run the same oil.
Every diesel Ive even seen turns the oil darkblack after very little runtime. The only reason my Cummins even hazes is because of all the additives I put in it so that may account for the darkening of the oil somewhat. Your engine isnt dying and its not hurting anything.
17 Dec 15 2018. Every diesel I have changed the oil in Powerstroke Cummins or Duramax the oil turns black quickly even on 73 and 59s that dont have any emissions controls. Its completely normal for a diesel it means the detergents in the oil are doing their job cleaning up the soot.
So you can see how much smaller of a material you are filtering out. Most wear causing particles are above 5 microns. Bypass filters also help reduce soot loading of oil which is what turns the oil black.
So you get a cleaner oil that lasts longer and. This article will answer the following questions. Why is my hydraulic oil or fuel turning black.
Why are air handling properties of an oil important for good lubricant health. Is my hydraulic pump cavitating. I have recently switched oil types and now my oil has turned black - why is this.
How does air cause my oil or fuel to turn blackAir entrainment can be a major issue in your lube oil. Oil Change Intervals for DieselEngines Most diesel engines should have their oilchanged about every 3000 miles if youre using standard oiland every 5000 to 6000 miles if youre using full syntheticoil. Moreover what does it mean when engine oil is black.
Oil can be very very dark blackeven and still be effective. Im using Mercurys synthetic blend oil in my Verado. Im not concerned about this being abnormal.
Im just wondering why some but not all new and healthy diesels and all Verados do this from the time they are new. There has to be more to it than leaky rings and valve stems if a new 50000 diesel turns its oil black immediately.