(19) |
 |
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(11) |
EP 1 418 220 A3 |
(12) |
EUROPEAN PATENT APPLICATION |
(88) |
Date of publication A3: |
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12.12.2007 Bulletin 2007/50 |
(43) |
Date of publication A2: |
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12.05.2004 Bulletin 2004/20 |
(22) |
Date of filing: 15.08.2003 |
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(51) |
International Patent Classification (IPC):
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(84) |
Designated Contracting States: |
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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 |
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Designated Extension States: |
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AL LT LV MK |
(30) |
Priority: |
31.10.2002 US 285753
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(71) |
Applicant: Chevron Oronite Company LLC |
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San Ramon, CA 94583-2324 (US) |
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(72) |
Inventors: |
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- Roby, Stephen H.
Hercules
California 94547 (US)
- Ruelas, Susanne G.
San Pablo
California 94806 (US)
- Mayer, Richard J.
Novato
California 94947 (US)
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(74) |
Representative: Nash, David Allan |
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HASELTINE LAKE,
Redcliff Quay
120 Redcliff Street Bristol BS1 6HU Bristol BS1 6HU (GB) |
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(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.