One would expect motor oil to be brown.
It depends on the application, it can be reddish brow, clear or red.
As the additives wear out and the oil ages it will change to a dark brown color just like regular oil
A shark liver is a pinkish reddish color just like the human liver is. A sharks liver has the main function of storing oil.
physical change hunnythe color would be the property of the oilbut as you can see the color changesthe chemicals do not
Crude oil is about as different as cheese. Varies a lot. color is black/brown,water white,dark green,reddish etc. it depends upon the components it hold (As lighter components it hold as lighter in color and as heaver as dark it will be) density is between 700 - 1000 kg/cum and kinematic viscosity can be anywhere between 1 and 8 cSt (centi stokes)
when the oil on the dipstick changes color from a clearish golden brown to brown or black then you need to change your oi.
If it was reddish in color that is just what you did.
Black or brown but is another chemical is mixed it can turn different colours
To have the skin Brown on a Roasted Chicken...Simply brush the skin with butter, margarine or oil before cooking.
Most likely blown head gasket but for some reason you have water or coolant in your oil