NTD300 wrote:
很多人都說什麼夏天用...(恕刪)
0-20 5-20 10-30
前面的那個數子 才是跟氣候有關喔
越寒冷的國家 數字要越低
台灣亞熱帶國家 用20以下就可以了
話說現在好像 很少看到 10 20的了
所以如果是新車 1000 KM 換機油
可以試試用低番數(ex: 0W20)的機油對吧？
跑越多以後 再慢慢加上去 用用 5W30
ps.當然前提是平常上下班跑市區或低速(80以下?)路段多一點的...
還是大大有其他建議？
dammm wrote:
在bobistheoilguy網站上面提到
20年前根本沒有全合成0w20 0w30，原廠手冊根本不可能寫
但是問題是現在0w20 0w3比以前的機油好太多了
20年前老車一樣可以使用現在新油 除非會吃機油，才需要使用5w30 5w40 10w3 10w40
個人觀點分享:
當車主手冊寫 5W30 5w40 10w3 10w40<
應該表示原廠有測過對某顆引擎，他們是OK的，他們可以保證。
只要符合他們車廠發表出來規範，大家遵守，出錯機率較低。
除如文中所說，
20年前根本沒有全合成0w20 0w30，
代表那時原廠也沒有對0W20測試過 對吧?
所以換下去如何? 會有風險。
或許沒事 或許有事。
我是原廠派 不改車 順順開 自備機油回HONDA原廠保養。
好事多還我5W30 !!
攝影愛好者 wrote:
0w20 0w30 室溫 25 度 C 時他們黏度是一樣的
當車子運轉到一樣的工作溫度時黏度才會上升
一個跑到 20 一個跑到 30
油溫愈高黏度愈低
複製來的 cSt 解釋如下：
The standard unit used to measure viscosity is the centistoke (cSt). According to the Automotive and Industrial Lubricants Glossary of Terms:
Viscosity is ordinarily expressed in terms of the time required for a standard quantity of the fluid at a certain temperature to flow through a standard orifice. The higher the value, the more viscous the fluid. Since viscosity varies inversely with temperature, its value is meaningless unless accompanied by the temperature at which it is determined. With petroleum oils, viscosity is now commonly reported in centistokes (cSt), measured at either 40°C or 100 °C (ASTM Method D445 - Kinematic Viscosity).
..............
At cold temperatures, the polymers are coiled up and allow the oil to flow as their low numbers indicate. As the oil warms up, the polymers begin to unwind into long chains that prevent the oil from thinning as much as it normally would. The result is that at 100 degrees C, the oil has thinned only as much as the higher viscosity number indicates. Another way of looking at multi-vis oils is to think of a 20W-50 as a 20 weight oil that will not thin more than a 50 weight would when hot.
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