Thanks for your help in advance. I've a 2008 Peugeot DHI 16 stick shift car, and all of the sudden even without overheated, I found oil mixed with the coolant in the reservoir. It is not a milkshake color mixture, but pure black oil. (Note: there is no oil cooler or gear oil cooler in that kind of cars.) I need to know the reason and how to repair, if you please. Much obliged!

  • Welcome to Motor Vehicle Maintenance & Repair! Are you sure oil wasn't added to the coolant by mistake instead of getting added to the crankcase? Whatever the cause, you're going to need to flush your cooling system, probably several times, to get rid of the oil. Might as well start there. – Pᴀᴜʟsᴛᴇʀ2 Jun 29 at 15:31

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