Get free shipping and a one year lower price guarantee on all our Lexus HS 250h air filters. The internal combustion engine in your Lexus HS 250h is really just a big, complex air pump. Air gets sucked in, mixed with fuel, burned and sent back out in the form of exhaust. But since air around motorways tends to be dusty, dirty, debris-laden, there needs to be a filtration device to stop all that engine killing crud before it makes its way to your Lexus HS 250hs engine's internals. Enter, the car air filter. So whether you find yourself on the OEM side or the performance side of the debate, we can all agree on one thing, your Lexus HS 250hs engine needs an air filter. And now that you know what an air filter does, go out and start dropping your new-found knowledge!