Joined Sep 7, 2015 Messages 761 Location West Midlands Car GLE350d (W166) I know all engines are different but whats the feeling on average oil consumption on these units? W211 - OM642 - V6 3L Engione Oil Consumption Thread starter David404; Start date Mar 22, 2016; Tags consumption engione oil om642 w211 Mar 22, 2016 #1 David404 Active Member. OM642 Oil Cooler w/ Seals. The test is then ended. fuel, engine oil, gear oil… The cylinder walls look like polished mirrors. Reasons for Engine Oil Consumption. Oil leaking from oil cooler is a problem that affects 2007-present V6 diesel engines. The Mercedes-Benz OM642 engine is a 3.0 litres (2,987 cc), 24-valve, aluminium/aluminium block and heads diesel 72° V6 engine manufactured by the Mercedes-Benz division of Daimler AG as a replacement for the Mercedes straight-5 and straight-6 cylinder engines.. The soot causes "Bore Glazing". Operating Fluids are products necessary for Mercedes-vehicles / major assemblies, e.g. In addition, there are upgraded seals available. High mileage vehicles may burn oil and need regular oil level checks. The oil cooler is the most famous leak. Special fuel system cleaners help prevent the oil … Vito 3.0 2006-2016: Engine code: Unit: Change interval: Fluid type: OM642.990 : Hydraulic brake and clutch systems These engines are used in a … If you add more oil than required, read the section below on how to remove excessibve oil. The oil cooler is no longer a problem on the newer models, but there are about a dozen other known leaks. Over time this causes Blow-by / oil consumption. The soot in the oil is actually thicker than the oil film. After 1000 miles, the oil is changed to a better oil that doesn’t breakdown on the piston rings or vaporize when it gets hot. If engine is driven at high RPMs frequently an increase in oil consumption may be noticed. As we mentioned above, engine oil cooler leaks are a common issue with certain Mercedes BlueTEC diesel cars. This is a common oil leak source on all Mercedes engines. Oil leaks are caused by excessive crankcase pressure from the blow-by at the piston rings. get this system wrong and it will cause high oil consumption... because there is massive air flow beneath the pistons and nowhere to go so it forces oil up past the piston rings in the wrong direction ... 2007/8 Chrysler, 300c, OM642 lump Nov 11, 2017 #39 The engine breather contains a rubber disc, that rips over time. Soot is like tiny clumps of hard carbon floating in the oil. It is caused by hardened oil cooler gaskets. Specifically, the Mercedes “3.0 liter V6 diesel” engines, designated with the engine code “OM642”, also known as the “642 diesel”. Considering the amount of work that must go into reaching the oil cooler, repair times can vary widely, but generally it is accepted that 10 hours is a good starting point. Good news is that oil cooler itself can be reused. A better oil withstands higher temperatures and won’t let combustion gases enter the crankcase. There could be many reasons causing oil consumption. This level is reached when the sum of all damage caused to the teeth of the gear wheels is more than 20 millimeters. When 5W/30 oil gets hot, the oil film gets very thin. The reference oil came up to damage force level 4; the oil mixed with CERA TEC reached as far as level 9, hence to more than double the level. Oil Leaks. The aim of the experiment is to reach the damage force level. The Mercedes-Benz Specifications for Operating Fluids provide you with an overview of the requirements for the operating fluids and for the recommended products. – Oil leaks: Oil leaks are well known on the OM642 V6 BlueTEC. 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