What is blinker fluid used for?

Blinker fluid is a fictitious automotive “fluid” that is often joked about in the auto industry as a way to prank inexperienced or gullible car owners. The joke typically involves someone asking for blinker fluid at an auto parts store, only to be met with confusion or amusement from the salesperson.

In reality, blinker fluid does not exist, as turn signals on vehicles are actually powered by electronic systems and do not require any kind of fluid to function. The joke plays on the idea of someone being unaware of how their car works or what maintenance it may require.

Overall, blinker fluid is not a real product and should not be taken seriously. It is simply a humorous gag that has been passed around in the automotive community for many years.