So I just got a used 2015 Toyota Rav4 and I want to change the engine oil but I'm unsure of what grade oil to use, I'm from Jamaica and the dealer here uses 10w30, based on my readings I've come to realize that 10w30 is too heavy for that type of engine so I want to know what's a suitable grade oil, now I've seen oedosns using 0w20, 5w20 and 5w30. Also it's at 73,000+ Miles. Please advise me of the best grade to use given my country and temperature conditions, because the 10w30 makes the car feel sluggish and to me it's terrible on gas I assume the wrong grade contributes to that.
