Using this Mishimoto coolant expansion tank is straightforward. First, make sure your engine is cool before installation. Remove the old coolant expansion tank carefully. Then, install the new Mishimoto tank in its place. Ensure all connections are tight and secure. When it comes to the radiator cap, simply place it on the tank as you would with the old one. As for maintenance, regularly check the coolant level in the tank. If it's low, add the appropriate coolant. Also, inspect the tank and its fittings for any signs of leaks or damage. If you notice any issues, reach out to us right away. Remember, this tank may not fit well with the stock air intake “S” hose, so it's a good idea to use an aftermarket intake for the best fit.