Brother. I am in process of restoring my khyber. I have rebuilt transmission from M.Ali Engineering near Waterpump. I do not think suzuki gear oil is good. Specially considering it is recommended to go for Zic oil in Liana Manual Transmission because of bad quality of Suzuki Gear Oil as the gear become hard and shifting becomes hard also specially first and second gear.
Also, According to my limited knowledge, Zic 75W/85 FF Gear Oil is best suited for khyber if your gearbox is recently rebuilt.
