| (19) |
 |
|
(11) |
EP 1 138 753 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
22.05.2002 Bulletin 2002/21 |
| (43) |
Date of publication A2: |
|
04.10.2001 Bulletin 2001/40 |
| (22) |
Date of filing: 21.03.2001 |
|
| (51) |
International Patent Classification (IPC)7: C10M 163/00
// (C10M163/00, 125:22, 129:54, 133:56, 135:18, 137:10, 159:16, 159:20, 159:22, 159:24),
C10N10:12, C10N40:26 |
|
| (84) |
Designated Contracting States: |
|
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
31.03.2000 US 540670
|
| (71) |
Applicant: Chevron Oronite Company LLC |
|
San Ramon, CA 94583-4289 (US) |
|
| (72) |
Inventors: |
|
- Timar, Joseph, Jr.
El Cerrito, California 94530 (US)
- Shrout, Michael A.
Oakley, California 94561 (US)
|
| (74) |
Representative: Nash, David Allan et al |
|
Haseltine Lake & Co., Imperial House, 15-19 Kingsway
London WC2B 6UD
London WC2B 6UD (GB) |
|
| |
|
| (54) |
Lubricant composition for air-cooled two-stroke cycle engines |
(57) A lubricating oil composition used in air-cooled two-stroke cycle engines having
a Mannich detergent and an ashless dispersant, wherein the ratio of the Mannich detergent
to ashless dispersant is from 3:1 to 5:1. The detergency additive may also contain
at least one of the following compounds: molybdenum, an overbased alkyl oxy benzene
sulfonate and an alkylsalicylate. The detergency additive of the present invention
provides improved detergency when used in a lubricating oil composition for air-cooled
two-stroke cycle engines.