Abstract: A lubricating composition comprising a base oil blend and one or more additives wherein the base oil blend comprises: a distillate naphthenic base oil having a saturates content as measured by IP368 of greater than 92 wt % and comprising less than 10 ppm of sulphur; and a Fischer-Tropsch derived base oil. The lubricating composition of the present invention exhibits improved detergency and engine cleanliness properties.

Abstract: A diesel engine system comprising a diesel engine provided with a crankcase comprising a crankcase lubricating oil, an air intake, an air compressor, an effluent turbine, an after cooler, and a blow by gas recirculation system comprising a conduit to recirculate the blow-by gas to the air intake, wherein the crankcase lubricating oil comprises an iso-paraffinic base oil having a saturates content of greater than 99 wt % and a viscosity index of greater than 120, a performance additive package system, and a viscosity modifier additive.

Abstract: A lubricant composition having a dynamic viscosity at ?35° C. of below 6200 cP as measured according to ASTM D 5293 and a mini rotary viscometer test value at 40° C. of below 60,000 cP as measured according to ASTM D 4684, having a Fischer-Tropsch derived base oil having a pour point from ?15 to ?31° C. and which base oil has been obtained by means of a catalytic dewaxing step, a pour point depressant additive 15 wt % or greater of a Detergent Inhibition additive package and Detergent Inhibitor additive package.

Abstract: A lubricant composition containing a mixture of at least two Fischer-Tropsch derived base oils and one or more additives wherein one Fischer-Tropsch derived base oil (low viscosity component) has a kinematic viscosity at 100° C. of less than 7 cSt and the second Fischer-Tropsch derived base oil (high viscosity component) has a kinematic viscosity at 100° C. of more than 18 cSt.

Abstract: The invention relates to a process to prepare a heavy and a light lubricating base oil from a partly isomerized Fischer-Tropsch derived feedstock, the feedstock having an initial boiling point of below 400° C. and a final boiling point of above 600° C. by (a) separating the fraction via distillation into a light base oil precursor fraction and a heavy base oil precursor fraction; (b) reducing the pour point of each separate base oil precursor fraction via dewaxing; and, (c) isolating the desired base oil products from the dewaxed oil fractions as obtained in step (b).