Sir Total Quartz 9000 Future Series 5w-30 is fully synthetic and can be easily used for 5,000-6,000 Kms, however, in case of Shell 5w-30 semi-synthetic (which is offered by Shell Pk here and I was talking about it), it is my personal suggestion that 3,500-4,000 Kms are good enough. For Shell 5w-30 Fully Synthetic, 5,000-7,000 Kms are good enough.
Rightly said, but brands, their R&D, market value, etc. matters a lot. We can not compare ZIC with Total and especially Shell, and then these 02 with Amsoil, Valvoline, etc.