Patent ID: 8318002

Claim:
A method for improving the solvency of base oil(s) comprising one or more hydrodewaxate base stock(s) and base oil(s), hydroisomerate base stock(s) and base oil(s), GTL base stock(s) and base oil(s), and mixtures thereof and improving the capacity of said base oils to solubilize performance additives, said base oil(s) having a kinematic viscosity at 100° C. of 3 mm 2 /s to about 50 mm 2 /s by addition to the base oil of a high viscosity Group I mineral oil, the high viscosity Group I mineral oil being characterized as having a kinematic viscosity at 100° C. of about 12 mm 2 /s and higher, the high viscosity Group I mineral oil being added to the base oil in an amount ranging from about 1 to about 55 wt % high viscosity Group I mineral oil based on the total weight of the mixture of the one or more hydrodewaxate base stock(s), hydroisomerate base stock(s), GTL base stock(s) or mixture thereof and the high viscosity Group I mineral oil whereby the solvency of the mixture is improved as evidenced by the mixture having an aniline point below the aniline point of the hydrodewaxate base stock(s) and/or base oil(s), hydroisomerate base stock(s) and/or base oil(s), GTL base stock(s) and/or base oil(s) or mixtures thereof and below the linear average of the aniline points of the high viscosity Group I mineral oil, and the hydrodewaxate base stock(s) and base oil(s), hydroisomerate base stock(s) and base oil(s), GTL base stock(s) and base oil(s) and mixtures thereof.