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Add contents to the oil when engine is warm. To obtain a good mixture with the oil after adding it, let the engine run or drive with the car for 5 minutes. 1 bottle of 325 ml treats 3-6 litres of engine oil.
Use at oil change or between oil changes as needed.
Allow the Wynn's Stop Smoke to drain fully from the bottle.
Wynns Petrol EGR Valve Cleaner 150ml