(19)
(11) EP 1 418 220 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
12.12.2007 Bulletin 2007/50

(43) Date of publication A2:
12.05.2004 Bulletin 2004/20

(21) Application number: 03255080.8

(22) Date of filing: 15.08.2003
(51) International Patent Classification (IPC): 
C10M 163/00(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30) Priority: 31.10.2002 US 285753

(71) Applicant: Chevron Oronite Company LLC
San Ramon, CA 94583-2324 (US)

(72) Inventors:
  • Roby, Stephen H.
    Hercules California 94547 (US)
  • Ruelas, Susanne G.
    San Pablo California 94806 (US)
  • Mayer, Richard J.
    Novato California 94947 (US)

(74) Representative: Nash, David Allan 
HASELTINE LAKE, Redcliff Quay 120 Redcliff Street
Bristol BS1 6HU
Bristol BS1 6HU (GB)

   


(54) A low-phosphorus lubricating oil composition for extended drain intervals


(57) The present invention is directed to a lubricating oil composition comprising a major amount of a base oil of lubricating viscosity and a minor amount of each of the following:
a) from about 3.0 to about 7.0 weight percent of an ethylene carbonated-treated ashless dispersant;
b) from about 2.0 to about 5.0 weight percent of a borated-treated ashless dispersant;
   wherein the weight ratio of a) to b) is about 0.3 to about 0.5;
c) from about 1.0 to about 3.0 weight percent of a high overbased metal-containing detergent;
d) from about 0.1 to about 2.0 weight percent of a phosphorus-containing compound;
   wherein the weight percent of total phosphorus in the lubricating oil composition is no more than 0.08 weight percent based on the total weight of the lubricating oil composition.





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