我自己也上網找到一篇機油文章，內容還蠻詳細豐富的，有興趣的人可以參考看看
http://dupont.myweb.hinet.net/teach.htm
to WORK大
我曉得拿706 10w-40(半合成)和Racing Special 5W-50(全合成)相比不太公平
只是想知用過這二種機油的朋友，是否有明顯差別而已!
work wrote:
5W50光基礎油等級就比10W40高了2級以上~...(恕刪)
黏度和基礎油等級無關
關於黏度可看
http://www.gulfoilltd.com/faq_s/index.html
2. What is viscosity ?
Viscosity is a measure of a fluid's resistance to flow. For lubricating oil in general, viscosity is the most important physical property. It is viscosity, as well as the pressure and speed of movement, which determines the thickness of an oil film between two moving surfaces. This in turn determines the ability of the oil film to keep the two surfaces apart, the rate heat is generated by friction and the rate the oil flows between the surfaces and thus conveys the heat away.
The oil should have a viscosity at the operating temperature that is correct for maintaining a fluid film between the bearing surfaces, despite the pressure tending to squeeze it out. While a reasonable factor of safety is usually desirable, excessive viscosity should be avoided because this can create more drag and therefore unnecessary heat generation.
Viscosity is also useful for identification of grades of oil and for following the performance of oils in service. An increase in the oil’s viscosity during use usually indicates that the oil has deteriorated to some extent, a decrease normally indicates dilution with fuel. The permissible extent of viscosity increase before corrective measures are taken is largely a matter of experience and judgement of the operator.
對於基礎油可看
http://www.gulfoilltd.com/faq_s/index?page=3
如何選用最合適的機油?
請參考您的汽車使用手冊，選擇最適用的機油。依據引擎的設計，個人用車之需求，以及最常遭遇的路況與駕駛習慣來選用最適合的機油。
如SENTRA 1.6-1.8 QG的引擎技術手冊就不建議使用05W-30的機油,但是2.0的QR引擎技術手冊就建議使用05W-30的機油可能減少油耗
原因
http://www.oil.net.tw/2004/0401/gf4.htm
PS:abo0412您保養完之後油門反應輕快許多，起步順暢好開,可能不是單純的機油問題哦
不過老闆賣706利潤一定沒有Racing Special 5W-50的好哦以打造終極 Skyline GT-R 為目標的職人
http://roadflight.pixnet.net/blog
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