TOTAL engine oil, what range of it? Feels differences compare to petronas engine oil ?

Thank you

Changing batt will not void ur warranty.
Abt tinting void warranty,  there is the chances where the water leak in which spiil the electrical stuff, but not from the rain. It is due to too much water the workers spray on the window while tinting.  But the chance is minimum, and look for better reputation workshop to do the tint instead of ah beng shop.
If SA ask u to go for the tinted he recommended to avoid warranty burned, most probably is that he wanna earn the commission from tinted.