(19)

(11)

EP 2 144 981 A1

(12)

(43) Date of publication: 20.01.2010 Bulletin 2010/03 (21) Application number: 08737167.0 (22) Date of filing: 01.05.2008

(51) International Patent Classification (IPC):  C10M 161/00(2006.01) C10M 167/00(2006.01) (86) International application number: PCT/GB2008/001555 (87) International publication number: WO 2008/139142 (20.11.2008 Gazette 2008/47)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 10.05.2007 EP 07251927 (71) Applicant: Castrol Limited Swindon Wiltshire SN3 1RE (GB)	(72) Inventors: ADAMS, Ieuan, Stephen Reading, Berkshire RG1 6EH (GB) BHASKARAN, Asha Mumbai (IN) LAMB, Gordon, David Berkshire RG7 6ES (GB) (74) Representative: Perkins, Nicholas David  BP International Limited Global Patents & Technology Law (Central) Bldg 200, 1st floor Chertsey Road Sunbury-on-Thames, Middlesex TW16 7LN Sunbury-on-Thames, Middlesex TW16 7LN (GB)