need your guidance regarding oil change. My Cultus 2014 is 75Km driven, this time I went for oil change mechanic told me to go for Havoline 20 W 50 as engine is getting old. I was have Zic 10 w 40 in my mind but I some have aggreed with mechanic and selected 20 w 50 for my cultus. Now after reading blog I have started worrying about engine of my car that I have used wrong oil on recommandation of idot oil wala. Should I continue with this 20 w 50 or discard this one?