Welcome to the CG family brother
I am sharing my Opinion:-
1) Brother, Almost all Petrol Pumps are good but PSO is WORST!!! Shell and Caltex are Recommended!
2) Caltex Havoline ( If u find the Original SEALED )
3) In the OWNERS MANUAl, it is recommended to change Oil at every 800kms but Caltex Havoline works fine almost upto 1500km but i change mine after every 1000kms
4) Well, Its written on the Chain Cover but 30 at front and 40 at behind.
5) The Original Tyre is not that Bad but i used DIAMOND ALTIS tyre on my Cg. It really Increased performance and handling.
6) Regular Waxing keeps it Clean!!!
7) Avoid Washing your bike at HIGH pressure WATER, especially from service stations. it will spoil our Bike Stickers and May damage your ( Desi ) Paint
8) As #6
9) For Original parts, i go to HONDA MAKHDOOM AUTOs aat Mc Loed Road.
My Personal experience with FORMULA 1 SCRATCH OUT is bad!! Maybe because i bought it as i assumed it could remove scratches too but i didn't liked it. i Use COSMIC wax. If you have Black colour go for SOFT99.