K2 Doktor Car Spec - 443ml. Adding Doktor Car Spec to the engine 1 2 3 (1) Unscrew the oil filler cap (3) Screw the oil filler cap on (2) Add Doktor Car Spec – depending on the engine’s wear and tear, use 1 can of Doktor Car Spec for 2 to 5 litres of engine oil.
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