I recently serviced my Touareg TDI including oil change, coolant flush etc. After changing oil I dispensed the old coolant into one of the empty 5 qt oil jugs. A week later I checked oil level it was slightly low so I topped it off using one of the 5 qt jugs that still had fresh "oil". As I started pouring the oil I noticed it seemed very thin. My dumbass just topped off the oil with used coolant. Another oil change immediately ensued.
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