Test for oil in coolant

[JPNinPA]

looks like a simple test to collect oil in coolant. You may see a bit on top but not know if that puddle is moving or growing.

There are other tests. This looks like a simple cheap test method.


https://youtube.com/shorts/87mIjSe3qVo?si=l_wM6UHyL51GeZK_


Never look down on anyone unless you are helping them up - Jesse Jackson