Using your Billetworkz Zero Series Oil Cap is easy. First, make sure your engine is cool. Then, remove the old oil cap and simply screw on the new one. For the best fit, tighten it by hand until it's snug. When it comes to maintenance, it's a good idea to clean the cap regularly. You can use a mild soap and water solution. Just wipe it gently with a soft cloth. Avoid using abrasive cleaners as they might damage the anodized or powdercoated finish. And remember, this cap is for specific Subaru models, so don't try to use it on other cars.