What Will Happen If You Put New Oil Into A Car Without Draining The Old Oil Or Changing The Filter

It is a Chrysler Town and country,

and my friends mom thinks it is alright to just add new oil where it says engine oil, without draining the oil, or changing the oil filter.

and she did it even though i tol her not to, causing the “engine oil” tube to overflow

I know, she is stupid.

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