wrote in

I have always wondered why it's colored????

Not sure about the oil coloration, maybe to differentiate it because it is
so thick, and may have additives that would cause failure if run in a
regular crankcase. The State of Utah has two tax rates on their diesel
fuel. The one for farm use is taxed a lot less, and is dyed. But if you
get caught running it in a vehicle with a license plate on it, I understand
it is a big fine.

Steve, a Utard