Using ZIC A+ in mehran is again not good because mehran's engine is not made to accept such low viscose oil.
But anyway, I'll suggest
PTT 20/50, SN grade, Mineral oil. C.I. 3~3.5K
or
SIM3 20/50, SM Grade, Semi Synthetic oil. C.I. 4~4.5K.
After using LM if you feel engine is responsive and doesn't give rough ideling, then its perhaps because imported oils has good thermal stabilities.
And lets call 'innocent' to those who use 20/50 in brand new GLI, XLI, CIVIC, CITI, etc.