All very simplistic answers as there are many grades of diesel engine oil.I suggest you phone a local renault truck dealer as it deepends on the age of the vehicle if you give them the registration number they should tell you what oil to use.Newer vehicles will probably need a semi synthetic engine oil or even fully synthetic as they have a long period between oil changes and if in doubt use a semi synthetic as this is a higher spec but only suitable up to 12-15 k miles service interval.If you are still worried PM me with vehicle details(age and reg) and I will tell you what to use.