**Multivariate Modeling in Quality Control of Viscosity in Fuel: An Application in Oil Industry**

Leandro Valim de Freitas1,2, Fernando Augusto Silva Marins2, Ana Paula Barbosa Rodrigues de Freitas3, Messias Borges Silva2,3 and Carla Cristina Almeida Loures2,3 *1Petróleo Brasileiro SA (PETROBRAS) 2São Paulo State University (UNESP) 3University of São Paulo (USP) Brazil* 
