I found SGO ultimate to be an excellent oil for my liana...i can say it is easily comparable to ZIC A which i suggested you..
Bahar market me sab oils fake hain...there is always a high chance of buying repacked f'ed oil...so best is to go to 3s and get 100% original product.
Btw, i am pretty sure the debate will not end up in your favour - they will never use lubes from outside...even if you change tyre size, they will end yr warranty...