PRODUCTION OF CYLINDER OIL

A method comprising providing a first fluid, second fluid, and third fluid having a first kinematic viscosity and a first BN, a second kinematic viscosity and a second BN, and a third kinematic viscosity and a third BN respectively, obtaining data identifying (i) a target kinematic viscosity of a cylinder oil to be produced, (ii) a target BN of the cylinder oil to be produced, and (iii) the kinematic viscosity and the BN of each of the first, second, and third fluids. Based on at least the identified kinematic viscosity and BN, the method comprises determining a ratio of first, second, and third fluid to produce a cylinder oil having a kinematic viscosity corresponding to the target kinematic viscosity and/or a BN corresponding to the target BN, and blending the first, second, and third fluids in the determined ratio to produce the cylinder oil.