hello guys.. i need to change engine oil for mehran 2013 model. its driven 46000 km. previously i used Zic X7 10w-40. should i go for 10w-40 again or switch it to Zic Hiflo 20w-50 or Zic A+ 5w-20.
im also confused what is exactly the difference between 5w-20, 10w-40 and 20w-50.
which will be the best oil according to car engine and current pakistan weather.
