It depends on the vehicle. After using 5w-20 to stay in warranty in my 2006 Honda Odyssey, I then switched to 5w-30. That immediately quietened the engines sound. My wife easily noticed it too. Conversely, I have tried different weights (including monogrades) in my older Chevy truck (4.3L V6) and there was no change at all.
5w20 or 10w30 & 5w30 or 5w40 no perceivable diff
- Thread starter wemay
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My 08 Jeep Wrangler with the 3.8L V6 called for 5W-20. That is what I ran the first couple of oil changes. One hot summer day while exploring the Nevada High Desert I noticed the engine was kinda noisy. Next oil change I used a synthetic 5w-30. I ran that weight for a lot of years. I didn't notice any change in how the engine ran or gas mileage but it was quieter. I also felt better when hauling my trailer. Not long before my LS engine swap I ran Mobil 1 0W-40 trying to slow down oil consumption. I did that a little but I still noticed no difference in how it ran or mileage.
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