Hello,
I changed my engine oil and drove 5000 miles. I used this oil "Extended Performance 5W-30 Full Synthetic Motor Oil,". It lasts for 15000 miles, but my is car is old, and my friend told me that I should not use this oil till I drive 15000 miles. Thus, I was wondering if you could tell me when I need to change my engine oil? So far, I have driven 5000 miles. Thank you!
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