I was just thinking about that today as I looked at my Insight dipstick with holes in it.
Someone else suggested putting a few drops of food coloring in the oil. Erm, maybe? Wondering what food coloring would do in the heat of the engine? Then again it’s used for baking, so maybe not a problem.
And, thanks for the compliment about the clean engine compartment. Unfortunately, this mostly means I haven’t been able to drive it much.