The number one recyclable part on your vehicle is its oil. Conventional motor oils are reliable for three months by most automotive standards. Synthetic oils will last a bit longer, but they can also be more expensive. Either way your vehicle goes through a lot of oil over a years time. If you take your vehicle to a service shop to have its oil changed, it should be getting recycled already, but if you do the work yourself, be sure to bring the used oil to your nearest recycling center.