A、It is free of charge if we make a reservation first. B、It is necessary to make an appointment in advance. C、It is more importa

　　Seasons come and seasons go. We change our clothes and our eating habits to suit the weather so that we’re comfortable. We go to our outdoor spaces to welcome warmth and sunshine, or make preparations to fight cold and snow. (16)When getting ready for the change of seasons, we need to remember to get our vehicles ready as well! When the days start to get shorter and the temperature starts to drop, it would be an excellent time to book an oil change, check over the vehicle, and adjust minor items like tire pressure and all fluid levels. Snow tires are an excellent investment for dealing with the challenges of driving through the dumps of the "white stuff. " Replace your summer windshield wiper blades with heavier winter blades, and stock up on washer fluid good to - 40 °C. Make sure you have a good ice scraper, snow brush and emergency kit in your vehicle before the snow flies! Once you’ve got through that seemingly endless season of cold and snow, it’s time to go through the process yet again. It’s time to summarize with an oil change, fluid level check, and taking off your winter tires; these are all welcome signs of spring. (17) Replace the heavy winter wiper blades once again with the lighter weight ones, and switch to washer fluid more suited to bug removal than ice melting. In addition, regular washing, waxing and detailing will remove dirt, snow, sand or salt that build up through day to day driving. (18) To keep your vehicle running smoothly and efficiently whatever the season is, do remember to call 905-417-9100 to book a service appointment. Those who call in advance will get a discount.
　　16. What does the speaker mainly suggest we do according to the passage?
　　17. How should we deal with the cars when summer comes according to the speaker?
　　18. What can we infer about the car service from the passage?