I compared all 4 companies with different cars and have the following conclusion:
1. Shell V Power - good quality oil, all rounded comparison base.
2. Caltex Platinum - Go further than all others. Tested on BMW L4, Nissan VQ V6, M-B V8 engines.
3. Esso (forget name, the expensive one) - seems to be the most powerful, go distance similar to Shell.
4. SinoPec Expensive - totally rubbish, made me changed oil sensor and overhead cam shaft; my old frd replaced cat after 1 tank.
Now I settle on Esso premium oil because it is cheap.