Using this power steering fluid cap is easy. Just remove your old cap and replace it with the Billetworkz cap. When choosing a color, pick one that matches your engine bay's style. For maintenance, you don't need to do much. But it's a good idea to check the cap periodically to make sure it's tightly sealed. If you notice any signs of wear or damage, replace it right away. As for the California Prop 65 warning, always be careful when working on your vehicle. Avoid breathing in the exhaust, and make sure to work in a well - ventilated area. Wash your hands often or wear gloves to reduce exposure to harmful chemicals.