@officialmusman
ZIC X7000 10W-40/CI-4 (5000) is for your 2008 model (Carburetor version) which suited your engine's zddp requirement.
You can compare yourself the Chemical & physical specifications of both X7000 & X7 both are of same viscosity 10w40 but later API rating is different which are SL and SP respectively.
SL is close to your engine's requirement. Use only Pak Suzuki manufactured Oil filters & Air filters(if you can buy from Suzuki 3S Dealers) or Guard Oil filters & Air filters from some authentic shop (preferably from Metro stores)
BTW in which city are you located? You can find official Zic Lube/ service stations near your location. Yo can go directly there otherwise you can order original Zic product from Zic official website.
A/C performance during day time in ambient temp. of 42 to 45 Degree Celcius is of course not the one which you can expect at 20-25 Degree or during night time but it is not " too bad too". Does your Cultus have original compressor or changed one? Please post your car pictures so that others can guide you accordingly.