Execute Oil Flammability Test

What happens here

The presenter drips a small amount of the engine's oil (suspected to be contaminated) onto one side of the metal trowel. He then drips a small amount of fresh, clean motor oil onto the other side of the trowel. Using a long-stemmed lighter, he applies a flame to the fresh motor oil, observing that it does not ignite. He then applies the flame to the engine oil, which quickly ignites and burns.

Goal: Test flammability of engine oil and fresh motor oil