| 摘要 |
PCT No. PCT/EP96/02268 Sec. 371 Date Apr. 3, 1997 Sec. 102(e) Date Apr. 3, 1997 PCT Filed May 22, 1996 PCT Pub. No. WO96/39477 PCT Pub. Date Dec. 12, 1996Multigrade lubricating oils for use in lubricating internal combustion engines, using basestocks with low levels (<75 mass %) of saturated hydrocarbons, comprise less than 3 mass % of ashless dispersant derived from a polymer of number average molecular weight (+E,ovs M+EE n) of not greater than 5000, and a viscosity modifier package to give the desired viscometrics comprising at least one multifunctional viscosity modifier. These oils meet stringent engine performance requirements and specifically give adequate varnish inhibition without very high treat levels of dispersants and/or use of specific detergent systems so avoiding problems of oxidation stability, compatibility and engine performance debits.
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