看這一句 The reason is that warm oil has a lower viscosity and therefore flows better than cold oil.
(補充前麵說的 The viscosity of an oil is its resistance to flow. In the case of multi-grade engine oil, the oil is designed to have lower viscosity at cold temperatures and higher viscosity at high temperatures. )-- 似乎印證了 coorslight969 前麵的觀點。
估計應該說是相對稠度吧。
你們這些大活人,居然被幾個破計算機耍得團團轉。