Thanks for clearing the doubt. Today morning, I was at the Shell petrol station where I saw Shell Rimula R4 sold for 302 per litre. The spec says that its CI-4, E5/E7. I guess it should be a mineral oil. If I follow the 8k service interval, then going for Rimula R4 would save a lot of cost right? Because its a mineral oil, will it damage the engine? Or will it increase the wear and tear compared to a fully synthetic oil like Delvac 5W40?