| (19) |
 |
|
(11) |
EP 1 104 800 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
20.06.2001 Bulletin 2001/25 |
| (43) |
Date of publication A2: |
|
06.06.2001 Bulletin 2001/23 |
| (22) |
Date of filing: 04.12.2000 |
|
| (51) |
International Patent Classification (IPC)7: C10M 163/00, C10M 141/12
// (C10M141/12, 129:44, 135:30, 135:10, 139:00, 137:10, 135:18, 133:12, 129:10),(C10M163/00,
159:22, 159:24, 139:00, 135:18, 137:10, 133:12, 129:10),(C10N10/04, 30:04, 30:10,
40:25) |
|
| (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: |
02.12.1999 JP 34312899
|
| (71) |
Applicant: ORONITE JAPAN LIMITED |
|
Minatu-ku, Tokyo (JP) |
|
| (72) |
Inventors: |
|
- Andoh, Hiroki
Haibara-gun, Shizuoka (JP)
- Fujita, Hirokazu
Haibara-gun, Shizuoka (JP)
- Kozuka, Mitsuaki
Haibara-gun, Shizuoka (JP)
- Nakazato, Morikuni
Ogasa-gun (JP)
|
| (74) |
Representative: Nash, David Allan et al |
|
Haseltine Lake & Co., Imperial House, 15-19 Kingsway
London WC2B 6UD
London WC2B 6UD (GB) |
|
| |
|
| (54) |
Lubricating oil composition for gas engines |
(57) The present invention relates to a lubricating oil composition for internal combustion
engines, particularly gas engines utilizing gaseous fuel, such as natural gas or liquid
propane gas. The lubricating oil composition of the present invention is useful in
a method of improving the detergency and oxidation stability at elevated temperatures
of gas engines. The lubricating oil composition comprises (a) a base oil, (b) a metal-containing
detergent, (c) a boron-containing alkenyl- or alkylsuccinimide, (d) a zinc dialkyldithiophosphate,
(e) an oxidation inhibitor and (f) an ashless dithiocarbamate.