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Buildup of oil sludge is a common issue that plagues this engine. Higher than average operating temperature, an insufficient oil capacity and the timing chain driven water pump leaking into the crankcase are all factors in why this occurs . [3] The 2.7 L V6 engines have suffered from oil sludge contamination.
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.
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.
compacted vermicular graphite cast iron (GJV/CGI), 62 kg (137 lb); UV laser-honed exposed bore; cast reinforcing bed-plate lower frame incorporating five main bearings (each 'bearing' affixed by four bolts), die-forged chrome molybdenum alloy steel crossplane crankshaft with first and second order forces and moments avoided, three-part oil sump ...
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1978-1980 Mercedes-Benz OM617 indirect injection turbodiesel. Prior to Volkswagen Group's first TDI engine, the first turbocharged diesel engine used in a passenger car was an indirect injection five-cylinder engine fitted to the 1978 Mercedes-Benz 300SD (W116) 300 SD sedan. [13]
The 1.8-litre petrol engine in the Passat and Audi A4 has a lower oil capacity than transverse applications of the same engine (4.6 US quarts (4.4 L) in transverse, 4.3 US quarts (4.1 L) longitudinal), and may suffer from oil sludge problems as a result, if not changed at regular intervals with fully synthetic oils.
The Volkswagen emissions scandal, sometimes known as Dieselgate [24] [25] or Emissionsgate, [26] [25] began in September 2015, when the United States Environmental Protection Agency (EPA) issued a notice of violation of the Clean Air Act to German automaker Volkswagen Group. [27]