Yes... You MUST test each plug independently. You may need a new realy(s) and/or temperature sensor in the back of the head. Also, do not run 15w40 (or thicker) oil in these engines. I, as does VW, recommends a 5w40 synthetic. 0w40 synthetic also works well. Thicker dino oil in these engines is not ideal. You will also notice a starting improvement, less (if any) need to adjust the valves, etc.
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