Oil leak on a BMW.

Oil leaks on BMWs

In Fluids by Steves Auto Repair and Tire

Some car problems can be fixed with just one small piece. However, sometimes replacing that part can be more labor intensive than is expected.

Earlier this week, we addressed an oil leak on a BMW. Our customer brought the vehicle in, because they noticed lots of oil loss. They had even gotten into the habit of carrying around jugs of oil, because they knew they had an oil leak but didn’t know where it was coming from. The undercarriage of the car was completely saturated.

The BMW needed a new alternator bracket oil seal, which can harden and become brittle after a period of time. 

To complete this project, our technician had to remove fan components and the alternator. The engine was also lifted up and the engine mounts were taken off. Then, everything was put back together. This process took a number of hours.

Oil seal.

Oil seal

Why oil is important

Different areas of the engine need to be lubricated by oil in order to work properly, and there are oil pressure sensors associated with certain components. This is why it’s important to have regular oil changes performed. 

We recommend this service every 3,000 to 5,000 miles, but the frequency depends on the vehicle and manufacturer recommendations.

A lack of oil in the system may result in an overheating engine or an engine seizing.

What can cause oil leaks?

The oil seal going bad is a common problem among V8 style engines. They can start leaking so badly that the oil gets too low, causing engine damage. The seals will, literally, pump the engine dry. So, when these components go bad it’s very important to have them fixed as soon as possible.

Depending on the location of the leak, it could impact the timing belt, serpentine belt and other parts.

Aside from a bad seal, there are several other issues that can lead to oil leaks, such as a damaged oil pan, worn valve cover gasket, and a clogged PCV system.

You may have an oil leak if you notice engine noise, the oil is low, there’s a puddle of oil – which can be brown, black or yellow – near the vehicle, or the car is experiencing running problems.

The oil pressure light turning on is another indicator to watch out for. It warns you that the oil pressure is decreasing. If you notice this symbol come on, you should safely stop the vehicle and check the oil level. 

Finding oil leaks

If you notice any of these symptoms, reach out to a mechanic or auto repair shop near you. They can help you find the source of the leak early on and prevent it from growing into a bigger problem.

Our process for finding oil leaks varies among vehicles. Our Woodbridge mechanics usually start by inspecting the three main areas oil will leak from – the valve covers, the timing cover, and the oil pan. There are also different parts that need to be checked within those areas.

If the oil leak is widespread, they will clean it off, add UV dye, drive it for a bit, and see where the first spot is.

Steve’s Auto Repair & Tire is an authorized Goodyear tire dealer located in Woodbridge, Virginia. Automotive repair services are performed on all makes and models, including BMW and Mercedes. Services include oil changes, brakes, alignments, inspections, and computer engine diagnostics.