求翻译：喷油嘴的清洗不一定能达到最好效果，不是必要的，新车更是没有必要。如果觉得汽油不够干净，可自备燃油添加剂，根据需要添加，4S店和汽车大卖场都有售。开车去外地的话特别要配备一瓶，因为外地的油品质量没有上海好，加好油后可自行按一定比例注入加油口。燃油添加剂的作用是提高汽油辛烷值，即提高汽油的燃烧率，令发动机不会发生爆震和抖动；待汽油充分燃烧，发动机做完功后，废气经三元催化器转换后排出。是什么意思？

Nozzle cleaning may not be able to achieve the best results, not necessary, the new car is not necessary. If you think gasoline is not clean enough, may bring their own fuel additives, according to the need to add, 4s shop and car supermarkets are sold. Drive to the field, especially with a bottle o