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You will have excess engine wear. Look at it this way. The engineers designed the engine in your car. They then chose a weight of oil that you should use. You decide to ignore them and use something else. What exactly do you think will happen? And besides, what good reason do you have for using a weight of oil other than what they recommend? But, it is your car so use what you want, just don't expect good results.

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Q: What happens if 10w30 oil is used instead of 5w20 oil?
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