my vote goes for PETROMIN ULTA 7 in Mineral Oil
while Mobil 1 in synthetic one
but as u asked for Climate & cars here, the best option is only PETROMIN ULTA 7 which is afforadable in 20W-50 because in most parts of country, this temp. range suits & also specially for suzukis engine, mineral oil are ok for them, waste to use synthetic one on them
as my experience, ZIC is not good quality but it has strong marketing techniques,initially when they launched, they used to say use ZIC, it will increase your mielage
anyways nowadays only PETROMIN ULTA 7