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LeanBurn · 03-19-2014, 04:15 PM

I wouldn't go to a 5w20 even if my engine was back spec'd. Stick with the 5w30, your engine will run as it did before and your fuel economy will still be the same as well.

I have run 5w20, 5w30, even 5w40 and never noticed any fuel economy changes that I could even hint at.

03-19-2014, 04:15 PM	#5 (permalink)
LeanBurn Got MPG? Join Date: Sep 2010 Location: Southern Alberta, Canada Posts: 330 The Car - '09 Toyota Corolla CE Enhanced Thanks: 13 Thanked 43 Times in 38 Posts	I wouldn't go to a 5w20 even if my engine was back spec'd. Stick with the 5w30, your engine will run as it did before and your fuel economy will still be the same as well. I have run 5w20, 5w30, even 5w40 and never noticed any fuel economy changes that I could even hint at. __________________ 2013 Honda Civic Si - 2.4L OEM front to back belly pan from the factory.