I’ve recently been changing some timing chains on a mix of diesel and gas cars. I’ve noticed with the diesels, while the oil is generally black compared to the gas however the inside of the engines are cleaner, nothing has that golden tarnish or sludge that you see in gas engines? I’ve noticed the pistons and heads don’t have any heavy deposits on them, they’re black but it seems more like a thin layer of soot vs the heavy deposits seen on a gas car.
Why is this, is there something in gas that reacts with oil, do gas engines run hotter and burns the oil?
Why is this, is there something in gas that reacts with oil, do gas engines run hotter and burns the oil?