There is oil in radiator, oil level and cap look ok.

What is your question?

There is oil in radiator, oil level and cap look normal.After engine is heated spilled oil produces smoke which is a scary sight but temperature gauge does not rise up. Coolant level despite added oil is down a little,I think it leaks out because overheating (Temp.gauge does not go up despite overheating due to the oil in radiator)Can Differential or transmission oil leak in to radiator.. What is this, where is this oil coming from ? Thanks.