This problem may affect any Mercedes-Benz vehicle, including Sprinters equipped with a diesel engine. Otherwise, reduced lubrication and cooling could cause additional damage to your engine and other drivetrain components. Whatever is causing the issue, you should fix it without further delay. Other possibilities include leaking head gaskets and cracked cylinder heads, which may happen if the engine overheats. In most gasoline Mercedes-Benz cars, this will most likely be caused by a leak within the oil cooler. ConclusionĪs we have explained, light-brown sludge inside a coolant tank is a sign of oil mixing with coolant. This is because such a mixture will not cool down the engine under high loads. And even if this happens another way around, allowing the oil to leak into the coolant, it can still be damaging. This reduces its ability to lubricate moving components and causes extensive mechanical wear. If the coolant leaks into the engine, it dilutes the oil inside. You should check for a blown head gasket if the oil is white or milky. You can perform an oil change to confirm the problem is not a blown head gasket. Wipe off the bottom of the oil cap and take longer trips, making the moisture evaporate. This is usually caused by condensation inside the engine, which is common if the vehicle is used for short trips. To fix the issue, owners will have to replace the whole radiator. If that happens, the transmission fluid will mix with coolant. In most cases, this cooler is an integral part of a radiator, where it may develop a crack. RadiatorĪn engine oil cooler is not the only such component, as cars with automatic transmissions have one for the gearbox. Luckily, most Mercedes-Benz engines are not prone to these failures, although they still can happen. And to make things worse, not all workshops can determine if the head is faulty, as this can only be done using specialized testing equipment. This is, by far, the most expensive and complicated failure to repair, as cracked heads need to be replaced with new ones. Like head gaskets, the cylinder head itself may crack if overheated. This is where mixing these liquids may happen, as the head gasket can crack if the engine overheats. It also has a lot of holes that serve as channels through which oil and coolant flow. Its job is to ensure an air-tight seal between these components that is strong enough to cope with the combustion process. Blow Head Gasketĭespite their differences in design and configuration, all engines have a head gasket between a cylinder head and an engine block. On most Mercedes-Benz models, replacing this component is a relatively easy job. And among all possible causes that would cause such symptoms, a leaking oil cooler is the most likely one. In some cases, the metal core of a cooler may crack, allowing the oil and coolant to mix when the engine is running. Replacing the oil cooler gasket is a simple repair that can be completed at home and will, in most cases, fix the problem. These are radiators through which a coolant circulates and keeps the oil at an optimum temperature. Most Mercedes-Benz engines have an oil cooler, although this is not something all car owners know about. In addition, we will find out how to determine which of them is the most likely cause and what to do to solve the issue. To help you avoid such situations, we will go to several common faults that cause this. Still, identifying the actual culprit may not be simple and can sometimes result in unnecessary repairs and expenses. This awkward-looking sludge is a mixture of oil and coolant, meaning these two liquids come in contact somewhere within your engine or cooling system. The most common problem is that Engine Oil is Mixed with Coolant. Have you noticed that the coolant in your Mercedes-Benz has become light brown as if someone replaced it with a cappuccino or something similar? If that’s the case, you almost certainly have a real problem on your hands that requires immediate attention.
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