[问题] what is the difference of engine oil 5W30 and 10W30

Linbaby

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2003-06-21
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I have my car's engine oil changed last week in Canadian tire. They used 10W30. I checked in the driver's handbook. It said my car should use 5W30. What is the diference. Will the wrong engine oil do any harm to my car?
 
冬天是不是还要再换一次?
 
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