10 Warning Signs of VW Oil Sludge Buildup

Sludge buildup in your VW’s engine is a very serious matter which should not be ignored. It is critical that you pay attention to this because, once there is sludge in your engine, it is next to impossible to clean it out. Eventually, this may lead to catastrophic engine failure.

The good news is that if you keep your Volkswagen on a regular maintenance schedule, sludge buildup and many other problems can be caught at an early stage and mitigated without too much effort. In this article, we will discuss how to recognize if there is sludge buildup and how to avoid it.

What is Sludge Buildup in a Car Engine?

When engine oil is oxidized and contaminated it turns into a thick gel and settles at the bottom of the sump (oil pan). This is a tar-like substance that blocks oil passageways, preventing the proper flow of motor oil through the engine, causing overheating and other problems.

What Causes Sludge Buildup in Engines?

These are the main reasons why sludge is formed.

• Oxidation: When blow-by gasses containing unburned fuel pass back into the crankcase and come in contact with engine oil, the oil oxidizes. This causes a thickening of the oil. A malfunctioning PCV (positive crankcase ventilation) valve can lead to such a problem.
• Heat: It is inevitable that over time, and due to heat, motor oil will degrade and eventually turn into sludge.
• Contamination: When metal shavings, road grime, and other contaminants enter the oil stream in the presence of heat, the oil deteriorates and forms a thick, gelatinous, sticky goo.

Warning Signs of Sludge Buildup in Your Car

• Engine Overheats: Sludge hampers the oil to flow freely through the engine preventing it from cooling and lubricating it, leading to an overheated engine.
• Poor Fuel Economy: As sludge hinders the engine from performing optimally, you’ll notice bad gas mileage.
• Unusual Noises: Lack of lubrication creates friction and the engine components knock against each other and create all sorts of clicking and tapping
• Rough Idling: If your car lurches and vibrates while idling, it’s because sludge is hindering the smooth circulation of oil.
• Oil Filter has Sludge: If you see sludge in the oil filter, that’s definitely an indication your Volkswagen has sludge buildup.
• Oil Leaks: Sludge will lead to slow oil drain because it builds up pressure in the crankcase, which leads to weakened or blown seals and gaskets.
• Thick, Dark Exhaust: Sludge is a reason why you may see thick, dark smoke coming out of your VW’s tailpipe.
• Low Oil Pressure: Sludge affects the flow and pressure of the oil in your VW, so you might notice the oil pressure warning light
• Change Oil Light: If this light comes on more frequently than expected, it could be because there is sludge buildup and motor oil cannot circulate.
• Check Engine Light (CIL): Any time there is a problem with the engine, this malfunction indicator lamp (MIL) will turn on. There could be any number of problems. You would need a mechanic with a scanner to read the error codes.

How to Avoid Sludge Buildup

Here are some best practices to keep sludge from accumulating in your engine. Granted, sludge buildup is an unavoidable chemical process, but it doesn’t have to destroy your engine, and you can stave off the process for a long time to come.

• Regular oil changes are a must.
• You cannot cheap out on filters. Use good-quality filters.
• Don’t let your car be a garage queen! It’s meant to be driven.
• Avoid idling your car for too long.
• Try as best as you can to not be in stop-and-go traffic.
• Short trips (less than 10 miles) are actually bad for your car. Make an effort to take it on a long drive at least once a week.
• Use high-quality fuel and consider using fuel additives. Feel free to ask us about this.

Andre’s Auto Service for Your VW

If you pay attention to these signs and follow good maintenance habits, you’ll be able to avoid problems from sludge buildup. At Andre’s Auto Service, we offer affordable, high-quality service. Our highly trained mechanics are here to help you and answer all your questions. Please call us or book an appointment to stop by our garage in Chicago, Illinois.