For a fast car, you need to lubricate your car’s axles to reduce friction. Any dry graphite will work well, and you can purchase it at the Scout Shop, craft stores or hardware stores.
Other options for dry lubricants include molybdenum (moly) or tungsten disulfide (WS2) powder. These lubricants are available on their own or mixed with graphite. They generally cost more, but some people think they are more effective than graphite.
Liquid lubricants are prohibited because they can cause a mess on the track.