[機油] 什麼是油泥(Oil sludge )?

The engine below suffered a major break down after 90000 and with 6000-mile oil changes.  The lubrication to the upper end was restricted by the sludge buildup.




The problem with the test supporting extended oil changes are, they are run on vehicles that get a lot of use. Taxi cabs, police fleets and test vehicles. These vehicles often see 50,000 miles a year and are being run with the engines at full operating temperature. This is ideal conditions for engine oil. The high temperatures quickly boil contaminants that are extracted by the positive crankcase ventilation (PCV) system.

This is not the case with the average passenger vehicle. Most vehicles operate five to ten-miles at a time. They rarely reach and hold operating temperature for long periods. In such a vehicle contaminants collect in the oil. This produces sludge, acids and depletes additives designed to keep seals pliable. The effect may be drastically increased repair cost.

Toyota oil pan. Engine has had 6000 mile oil changes.

Like any piece of metal that is heated and allowed to cool, there will be condensation in an engine. The oil attempts to suspend these contaminants. Since the contaminants are liquid, they pass through the oil filter. When engine oil temperature reaches 212' Fahrenheit, the liquids may begin to boil. They turn to vapor and eventually are extracted through the PCV system. This does not occur with five to ten-mile trips. Many engines also have small amounts of glycol that leaks past head and intake gaskets. This severely compounds the problem.

Another major difference between test and "real world" conditions is time. These factors take time to damage the engine. Running an engine for one-year and 50000 miles may show no problem at all. The same engine run five years and 50000 miles may tell a completely different tale.

清潔會傷油封,有疑問!有些機油就含油清潔成份,這樣油封不就早壞了

油封早壞了只是被油泥塞住,不要怪清潔劑

3mazda3 發表於 2018-6-23 10:38
清潔會傷油封,有疑問!有些機油就含油清潔成份,這樣油封不就早壞了

油封早壞了只是被油泥塞住,不要怪清潔劑 ...

有時比較像是用藥過度，良藥也變成毒藥。
不過我對於[用清潔劑之後會漏油]所抱持的看法，其實是舊油酸化就已經讓墊片跟油封內傷了，清潔劑其實是無辜的。

應該用全合成機油就蠻靠譜的啦，有一定的清潔性了

沒油泥的車，排氣管可以吹很多支蠟燭

油還是要常換
不然省小錢花大錢