blueg wrote:Air filter service indicator.
Chris wrote:No need unless you find yourself constantly driving in super dusty environments that can clog the air filter.
vadimivanovich wrote:Some vehicles have the indicator, and some have a brass cap that covers the port. It's nice to have some feedback about your filter's condition, but it's no big deal to live without it.
mogwild wrote:Lots of them deteriorate and stop working over time. Engine heat, clear plastic, I don't mind having one, but I don't miss not having one.