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Oil sludge or black sludge is a gel-like or semi-solid deposit inside an internal combustion engine, that can create a catastrophic buildup. It is often the result of contaminated engine oil and occurs when moisture and/or high heat is introduced to engine oil.
Sludge reduction: When installed before fuel separators, fuel homogenizers can reduce sludge production by breaking down larger asphaltene clusters. This allows separators to remove impurities more efficiently. Studies have indicated that sludge reduction of up to 50–80% can be achieved with the use of homogenizers. [3] [4]
The sludge ("residue") associated with engine oil recycling, which collects at the bottom of re-refining vacuum distillation towers, is known by various names, including "re-refined engine oil bottoms" (abbreviated "REOB" or "REOBs"). [9] A report from the U.S. Federal Highway Administration (FHWA) states that:
These blow-by gases, if not ventilated, inevitably condense and combine with the oil vapor present in the crankcase, forming oil sludge. Excessive crankcase pressure can furthermore lead to engine oil leaks past the crankshaft seals and other engine seals and gaskets. Therefore, it becomes imperative that a crankcase ventilation system be used.
n.o.s. = not otherwise specified meaning a collective entry to which substances, mixtures, solutions or articles may be assigned if a) they are not mentioned by name in 3.2 Dangerous Goods List AND b) they exhibit chemical, physical and/or dangerous properties corresponding to the Class, classification code, packing group and the name and description of the n.o.s. entry [4]
Many motor oils also have detergents and dispersants added to help keep the engine clean and minimize oil sludge build-up. The oil is able to trap soot from combustion in itself, rather than leaving it deposited on the internal surfaces. It is a combination of this and some singeing that turns used oil black after some running.
Fuel polishing is the technical cleaning process used to remove or filter microbial contamination from oil and hydrocarbon fuel in storage. It is essentially the removal of water, sediment and microbial contamination from such fuels as diesel, red diesel and biodiesel. This fuel contamination, also known as 'fuel bugs', or 'diesel bugs', or 'so ...
These engines are prone to oil gelling. Another name for the issue was "engine sludge". [1] There was a class action lawsuit due to this problem. [2] It is very important to the life of these engines that oil changes are done on a regular basis. The 1MZ-FE was on Ward's 10 Best Engines list for 1996. [3] Applications: 1993–2002 Toyota Camry (V6)
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