Using this Boomba dipstick handle is easy. First, find the OEM dipstick handle on your Subaru WRX from 2015 - 2021. Then, carefully remove it. After that, take your chosen Boomba dipstick handle and use the rollpin to install it in place of the OEM one. As for maintenance, just keep it clean with a soft cloth. If it gets dirty, you can use a mild cleaner. Avoid using abrasive materials that might scratch the handle. When choosing a color, think about how it will look in your engine bay. And always make sure the rollpin is properly installed to keep the handle secure.