Lubricating composition
The present invention provides a lubricating composition suitable for use in a two-stroke crosshead diesel engine. The lubricating composition comprises a base oil blend consisting of base oil chosen from Group I, base oil chosen from Group II and deasphalted cylinder oil.
1. A lubricating composition comprising a base oil blend and an additive package, wherein at least 90 wt % of the base oil blend, based upon the weight of the base oil blend, consists of:
(a) base oil chosen from Group I with a kinematic viscosity at 100° C. (according to ASTM D 445/446) of less than 20 mm 2 /s, wherein the base oil chosen from Group I makes up at least 30 wt % and less than 94 wt % of the base oil blend, based upon the weight of the base oil blend;
(b) base oil chosen from Group II with a kinematic viscosity at 100° C. (according to ASTM D 445/446) of above 12 mm 2 /s, wherein the base oil chosen from Group II makes up at least 5 wt % and less than 45 wt % of the base oil blend, based upon the weight of the base oil blend; and
(c) deasphalted cylinder oil, wherein the de-asphalted cylinder oil makes up at least 1 wt % and less than 15 wt % of the base oil blend, based upon the weight of the base oil blend; and
wherein the lubricating composition has a kinematic viscosity at 100° C. (according to ASTM D 445/446) of above 12.5 mm 2 /s and below 30 mm 2 /s.
2. The lubricating composition according to claim 1 , wherein the additive package makes up less than 60 wt % of the lubricating composition, based upon the weight of the lubricating composition.
3. The lubricating composition according to claim 1 in an internal combustion engine.
4. The lubricating composition according to claim 3 , wherein the internal combustion engine is a two-stroke crosshead diesel engine.