I got 2nd engine oil changed to my 2011 Vitz 38000km done from Toyota 3s dealer. They have suggested & used 20w50 grade oil. Last time i used Havoline 10w30 grade and it went superb. I am confused now as if Toyota people did wrong in suggesting me the right oil. Should i drain new oil immediately to save engine and use Havoline 10w30 again? Please suggest. Thanks
