Leather is usually the most affordable waterproof car interior material you can purchase. You can also look for what is called pleather which is fake leather but is also waterproof as well.

You will want him to have an assortment of products to keep his new ride shiny and clean, and also products that will help the interior stand up to the rigors that an 18 year old will put it through! Armor All makes a long line of products that will protect the vinyl interior, and scotch guard provides products that can help keep any cloth materials stay stain-free and new. A canister of pre-treated ArmorAll wipes will come in handy when he wants to do last minute touch-ups before picking up his friends!

New car warranties are typically anywhere from 3 to 10 years depending on the make and model of car. Some foreign cars do have longer warranties than American cars, but some also have shorter ones. All depends on the car.