5W/20 is recommended by some manufacturers due to a better Fuel Economy Rating. My owners manual recommends the 5W/20 for better fuel economy (thinner oils provide less resistance) and better cold weather performance. I live in Texas, rarely does our temperature get below 0 degree F. Due to our temperatures being warmer most of the year, I will be using Mobil 1 10W/30 in my engine........the viscosity recommendation shown in my owners manual.
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