2W公里前冲动了一下，买了KN 57i。在行驶了10000公里后，考虑到一直听到网上的朋友和JS说5000公里最好洗一下，我匆匆的洗了一次。最近又1W公里过去了，今天下班回来后顺便拆了它下来，回来准备洗。一直以来没有看过它的说明书，今天好奇的瞄了一眼，看到如下：K&N AIR FILTER CLEANING INSTRUCTIONS我来翻译一下：KN风格清洗指南Most K&N Air Filters will normally require cleaning every 50,000 miles.我来翻译一下：大部分的KN风格通常每50000英里清洗一次。 看了我顿时晕了，是印刷错误？多了个0？然后上了KN的官网查了查。http://www.knfilters.com/faq.htm#44. How often do I need to clean my K&N air filter? If you have not experienced a decrease in mileage or engine performance, chances are your filter is fine and does not yet need cleaning. To be more specific, the filter does not require cleaning if you can still see the wire screen on the entire air filter regardless of how dirty it may appear. When the screen is no longer visible some place on the filter, it is time to clean it. When used in normal paved road, street or highway conditions, our replacement air filters that fit in the factory air box should require cleaning every 50,000 miles and our large conical filters on an intake system should require cleaning every 100,000 miles. When used in dusty or off-road environments, our filters will require cleaning more often. We recommend that you visually inspect your filter once every 25,000 miles to determine if the screen is still visible. 我来翻译一下：多久需要清洗我的KN风格？如果你没有经历行驶里程的减少或发动机性能下降，证明是你的风格是状态完好的，还不需要清洗。更具体些的说，如果你仍然可以看到整个风格上的筛网表面，则该风格不需要清洗，无论表面有多么的脏。当筛网表面的某些地方上不再可见的话，那就是时候清洗了。当行驶在铺平道路，街道或公路的路况下，我们的风格，要求每50000英里清洗一次，而锥形风格需要每100000英里清洗一次。当在灰尘或越野环境下行驶的话，将需要清洗的频繁些。我们建议您每25000英里目测检查您的风格来确定筛网表面是否仍然是可见的。看到这里我相信我们那些网上贴来贴去的说法的不科学。所以鉴于中国的道路和空气质量的糟糕，我对于我的57i会每隔30000公里清洗一次！