The Luber-Finer MP995 Fuel Filter and MXM NanoTech Air Filter offer high-efficiency filtration. The MP995 has 99.5 percent efficiency at 4 microns, according to the company. The filter removes water to protect heavy duty engines and also removes diesel fuel contaminants present in new biodiesel fuel mixtures. The MXM features non-fiber media. According to the company, the air filter has 99.9 percent overall efficiency and traps dust that can cause engine wear and damage.