The mining sector throughout its history has been receiving pressure to increase production, with lower costs and with less environmental impacts. This pressure has been transferred to the OEMs to manufacture faster equipment, with more horse power, higher efficiencies, while generating lower emissions. This can be seen in the evolution of equipment that have become ever larger and more efficient. To meet this need the engines and transmissions need to produce/transmit increasing power and the hydraulic systems need to work with extremely high pressures, requiring that these components be designed with tighter clearances and therefore requiring lubricants and fuels with a high level of cleanliness. In order to meet the increasingly stringent emissions requirements, engines need to work with higher pressures and increasingly cleaner fuels. Year after year the contamination impact in the mining sector is becoming more critical due to: • New fuels technologies, such as ultra low sulfur diesel (ULSD) and biofuels • New legislation with greater emissions restrictions • New equipment technologies to improve energy efficiency, power and speed It is important to highlight the importance of fuel and lubricant cleanliness due to: • Higher pressure of fuel and hydraulic systems • Closer tolerances