Why is the letter o of Mobil Oil red in colour?
because it stands for OIL Because a mobil horse has a red tounge. The "O" is red in color because it stands for OIL There may not be any specific reason: the artist responsible says, "Back then I was using typography as paint, and doing it with tremendous amount of arrogance, ignoring what the words were saying." (see http://www.typotheque.com/articles/old_guns/)
There is no white palm oil. Crude palm oil (CPO) is very rich in natural plant pigments called "carotenoids" giving the oil a distinct orange-red colour. After we refined CPO, all the carotenoids are removed and the refined oil is no longer orange-red but instead, golden-yellow. Red Palm Oil is special refine process which carotenoid still remaining in the oil.
Blood is not always red. The colour is dependant on it's exposure to oxygen. If there is oxygen in the blood it has a red colour. That is why whenever you bleed your blood is red, because it reacts with the oxygen in the air. When there is no oxygen in your blood though, your blood has a blue colour.
Either someone put transmission fluid in the oil filler or the transmission fluid drain plug was mistakenly opened instead of the engine oil. In other words, transmission fluid is red and engine oil should be amber to black in colour. Note some automobiles use red fluid for power steering as well but usually don't have a drain plug for that.