Production of cylinder oil

A method of operating a marine reciprocating internal combustion engine, the method comprising:

• producing a cylinder oil by:
• providing a first fluid having a first kinematic viscosity and a first BN, wherein the first fluid is a system oil, and the first BN is from 5 to 30;
• providing a second fluid having a second kinematic viscosity and a second BN, wherein the second fluid is an additive package, fresh cylinder oil, or used cylinder oil, and the second kinematic viscosity different from the first kinematic viscosity,
• providing a third fluid having a third kinematic viscosity and a third BN, the third fluid being a base oil and the third BN being less than 1;
• and
• blending the first fluid, the second fluid, and the third fluid in a ratio to produce a cylinder oil having a kinematic viscosity of 8 to 12.5 mm2/s at 100° C.;
• and
• supplying the cylinder oil to a cylinder of the marine reciprocating internal combustion engine.

An apparatus for the preparation of a cylinder oil comprising:

• a blender;
• a first container for containing a first fluid having a first kinematic viscosity and a first BN, wherein the first fluid is a system oil and the first BN is from 5 to 30, the first container in selectable fluid communication with the blender;
• a second container for containing a second fluid having a second kinematic viscosity and a second BN, wherein the second fluid is an additive package, fresh cylinder oil, or used cylinder oil and the second kinematic viscosity is different from the first kinematic viscosity, the second container in selectable fluid communication with the blender;
• a third container for containing a third fluid having a third kinematic viscosity and a third BN, the third fluid being a base oil and the third BN being less than 1;
• and
• a controller configured to determine an amount of first fluid, an amount of second fluid, and an amount of third fluid to supply to the blender for providing a cylinder oil having a desired target viscosity and a target BN, wherein the target kinematic viscosity is 8 to 12.5 mm2/s at 100° C.

A marine vessel comprising an apparatus, the apparatus comprising:

• a blender;
• a first container for containing a first fluid having a first kinematic viscosity and a first BN, wherein the first fluid is a system oil and the first BN is from 5 to 30, the first container in selectable fluid communication with the blender;
• a second container for containing a second fluid having a second kinematic viscosity and a second BN, wherein the second fluid is an additive package, fresh cylinder oil, or used cylinder oil and the second kinematic viscosity is different from the first kinematic viscosity, the second container in selectable fluid communication with the blender;
• a third container for containing a third fluid having a third kinematic viscosity and a third BN, the third fluid being a base oil and the third BN being less than 1;
• and
• a controller configured to determine an amount of first fluid, an amount of second fluid, and an amount of the third fluid to supply to the blender for providing a cylinder oil having a desired target viscosity and a target BN, wherein the target kinematic viscosity is 8 to 12.5 mm2/s at 100° C.