| 摘要 |
The present disclosure relates to a lubricating composition for a four-stroke engine, with low ash content including: a) one or more base oils selected from oils of Groups I-IV, preferentially from oils of Group III or IV from the API classification, b) at least one compound (b) selected from the group of heavy PAOs with a kinematic viscosity at 100� C. comprised between 75 and 3,000 cSt, optionally mixed with one or more compounds selected from the group of polymeric compounds of the polyisobutene (PIB) type, or one of their mixtures, and c) at least one ester of formula R(OH)m (COOR′(OH)p)n wherein m is an integer from 0 to 8, preferably from 1 to 4, n is an integer from 1 to 8, preferably from 1 to 4 and p is an integer from 0 to 8, preferably from 1 to 4 and wherein the sum p+m is strictly greater than zero, R and R′represent independently of each other a saturated or unsaturated, linear or branched hydrocarbon group, optionally substituted with one or more aromatic groups and including from 1 to 30 carbon atoms, and borated derivatives thereof; the composition having a sulfated ash content less than or equal to 0.5%, as measured according to the ASTM D874 standard, a phosphorus content less than or equal to 500 ppm, as measured according to the ASTM D5185 standard, and a sulfur content less than 0.2%, as measured according to the ASTM D5185 standard. The composition has good detergency properties, the use of which promotes fuel savings. |
