I brought my car to a mechanic and asked for synthetic oil change. However, now I have realized that mechanic has put a new sticker in my windshield that states that next oil change is due in 3000 miles. With synthetic oil range should have been 6000 miles. I called mechanic and asked if it is really synthetic and he confidently claimed that it is a simply a mistake in the sticker and I should drive 6000 miles.
Is there a method that I can use to independently verify if my mechanic really used synthetic oil and not organic oil?
This is for
Chevrolet Aveo 2007 and the sticker says