原文章由 銀箭 於 2011-2-18 22:34 發表 ![強油『 殼皇 』Shell/Ultra10W60---2/18日1000公里終測更新P.33234]()
感謝補充
另外補充一點
比起一般以原油為原料的基礎油，SHELL XHVI的優勢之一在於其以天然氣為原料，因此完全不含硫，各位知道硫可是酸性物質，無論經過多麼複雜的脫硫程序也不可能完全去除，因此不含硫的SHELL XHVI對於引擎來說可說是立下的最理想的根基。
Sulfur
Sulfur occurs naturally in most mineral base oils. The API has designated maximum sulfur levels for Group I, II and III base oils, with Group I having a higher sulfur allowance than Groups II or III. Group IV PAO, which is a synthesized hydrocarbon, is sulfur-free. Surprisingly, sulfur improves the base oil's lubricity (the oil's ability to lubricate under boundary metal-to-metal contact conditions) and natural resistance to oxidation. In fact, sulfur is a component in many additive formulations, including antioxidants, antiwear (AW) agents and antiscuffing or extreme pressure (EP) agents. Why, then, is lower sulfur associated with higher base oil grades? Modern lubricant formulators prefer to control the chemical context where the sulfur resides in the finished lubricant. Therefore, they prefer to start with a base oil containing a low concentration of naturally occurring sulfur so it can be added back into the concentration and chemical form believed to be appropriate for the application.
by machinerylubrication
為了驗證他的說法 看國外機油分析就會知道group4 以上的油品 ZDDP的消耗相對來說是非常少的
如motul 300v power redline CFS
這幾款的檢驗結果都很清楚可以看到 (這裡只貼MOTUL的 其他石油版找都找得到..)
酸的東西用的少 TBN又高 所以基本上是不需要擔心的
酯類油不論在耐用度 清潔性跟生物分解性 都是目前最好
所以市面上有便宜的酯類油 如NANCAS REDLINE 的5W40價格都在300多一點是很好的選擇 |
