The air filter media chosen for this job is 99.8 percent efficient. Outperforming other manufactures in air flow tests. The media can be blown off after each night to help extend the life of the element. The filtration media is strong enough to withstand what forces may be encountered during the race. The inner and outer cage make it virtually indestructible. This is not your cheap “throw away”. This is purposely built to handle many nights of racing. No oil required.