im just wondering what happens to a honda civic if you used 10w30 instead...
If the car is new, or near new, you might just experience a little pre-mature wear on the tight fitting bearings, and it might be a little noisier than usual, but, for the most part, not worry. Just change back to the 5w30 soon to avoid trouble.
Nothing should happen. Most car manufacturers suggest that you use thicker motor oil in the summer months. This way the oil doesn't get too thin from the combination of hot weather and the hot engine temp.
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