My suzuki alto (VXR 2022) run quite smooth in first 15 to 20 minutes after that its feels rough, and small vibrations are felt in accelerator and clutch pedal. Air filter of car is fine. I am using Caltex 0w20 engine oil. What could be the possible cause. Could it be that the engine oil is too thin once engine is up to the running temperature? Besides that fuel milage is excellent of my car 23-24 kmpl.
