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It shouldn't affect it at all. A big reason the manufacturers went to 20-weight oil is fuel economy. The US government has a standard called CAFE - Corporate Average Fuel Economy. Wikipedia has a good article on it. To meet this standard they use every trick in the book, and one of them is thin oil which is easier for the engine to pump. Once you get the car home, you can put 30-weight oil in it and not hurt anything.

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9y ago
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Q: How will 5w30 oil affect a 2004 Honda Accord?
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