Delo 15w40 is designed for diesel engines. You need to verify whether it meets the standards of your gasoline engine. For 2001 models you would probably need at least a SJ category oil, it should be stated in the owners manual. I believe Delo 15w40 is only a SH.
The following website describes the categories
The following website describes the catergories
[URL=http://api-ep.api.org/filelibrary/API_MotorOilGuide_2004.pdf]