@adilfarid
what matter is correct grade and correct Viscosity. Check API S_ grade of your zic,may be u find SG grade in 10w40 by zic.10w-40 SG/SF grade comes in various brands like SGP,Caltex,Mobil,Castrol etc. too
If u want to assure,try to buy suzuki oil by 3S dealers and always take GST invoice by them. In combination,use QAIM OIL FILTER & QAIM AIR FILTER at every oil change.If qaim not available then go for Guard