Identification of second protection spark plug conditions
MagDelia 
9 19,000 kilometers, second guarantee. Both the first and second insurance products have a lot of oil, which has always been at the highest level. The first insurance products have added 5 liters. Enjoy 21 models of 530. The condition of the spark plug looks okay, there is not much carbon deposition, there is slight oil stains on the threads of the spark plug in cylinders one and two, which is not obvious, and it is normal for cylinders three and four. I use additives in every tank of oil. Half of the highway urban roads.
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