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The 5W-20 is thinner and more viscous. The reason Honda wants you to use it is because it decreases engine friction slightly and they can then claim better mpg. I use 5W20 or 5W30, which ever is cheaper when I buy it. My Odyssey is an 02 with 125,000 miles and still doing fine,

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16y ago
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14y ago

In simple terms the 5 in 5w stands for the weight or viscosity (thickness) of the oil in the Winter or cold weather. The 20 or 30 is the weight of the oil when the engine heats up. It is more complicated than this so if you want to know more click the link.

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Q: What is the difference between 5w20 and 5w30?
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