Asslamoelikum Friends! I was using Havloline 20w50 for my Automatic Coure 2008 (90k Driven), but I want to switch to ZIC (x7 10w40 )or Shell (HX6 10w40), I'm confused weather car start Reducing Engine oil or Produce white smoke. Please help me to take right Decision and recommend me which one is better ZIC or Shell. Engine is almost Perfect no issue at all.