BMW 335is Is Leaking Oil

Discover the Common Causes of Oil Leaks in Your BMW 335is and How to Address Them Effectively

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
80% chance it's the
Oil System Components
0%
20% chance it's the
Engine Gaskets
The most common reasons a BMW 335is is leaking oil are oil system component failure and leaking engine gaskets.
  • Oil System Components: A worn or damaged oil pump or filter can lead to low oil pressure, resulting in inadequate lubrication and potential engine damage.
  • Engine Gaskets: A worn or damaged engine gasket can lead to oil or coolant leaks, resulting in engine overheating or loss of lubrication.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a BMW 335is is leaking oil?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Oil pans don't wear out or break like other parts, they generally only need to be replaced because of external damage from an accident or an improperly tightened drain plug. The main symptom you will experience is an oil leak underneath the engine of your car. The oil that leaks from a damaged oil pan will range from dark brown to dark black. If the leak is large enough or occurs for long enough the oil level will be low enough to turn the oil pressure or low oil level warning light on.

An oil leak may be noted on the ground where the vehicle is parked. However, many vehicles have plastic trays underneath the engine that may catch leaking oil and conceal the leak. In such cases, a low oil level, a burning oil smell, or even smoke from oil burning in the engine bay may be noted.

»MORE: Signs of a bad oil pan gasket

A bad oil level sensor may cause a false reading of the engine oil level. The oil level warning light may illuminate even when the oil level (checked manually) is within an acceptable range. The warning light may also come on and off intermittently if the sensor is faulty. An error code may be sent to the PCM and a check engine light may come on the dashboard as well if the sensor is bad.

The engine oil pressure warning light will come on if the engine oil pressure is low, or if the oil pressure sensor is faulty. In either case, engine power may be reduced significantly. The check engine light may also illuminate, and an on-board diagnostic (OBD) trouble code will be stored in the vehicle's computer.

How to Diagnose and Fix Oil Leaks in a BMW 335is?

When tackling oil leaks in your BMW 335is, a methodical diagnostic approach is crucial for effective resolution. Start by visually inspecting the engine and surrounding areas for signs of oil accumulation, such as stains or puddles, which can indicate the leak's origin. Pay close attention to common culprits like gaskets, seals, and the oil pan, as these are frequent sources of leaks in BMW models. If you notice symptoms like a burning smell or low oil levels, these can signal a more serious issue that requires immediate attention. Begin your diagnosis with simpler checks, such as ensuring the oil filter cap is securely tightened, before moving on to more complex areas like the valve cover gasket or the engine valley drain hole. If the leak persists, consider the possibility of internal issues, such as a leaking engine oil galley. By systematically addressing each potential source, you can effectively identify and rectify the problem, ensuring your BMW 335is remains in optimal condition while preventing further damage and costly repairs. Regular maintenance and prompt attention to any signs of leaks will help maintain your vehicle's performance and longevity.

How to Diagnose and Fix Oil Leaks in a BMW 335is?

When dealing with oil leaks in a BMW 335is, it's essential to understand the common problems that can arise. One frequent issue is a failing valve cover gasket, which can lead to oil seeping out and causing visible stains on the engine or driveway. This problem often presents itself with symptoms like a burning oil smell and rough idling, indicating that oil is leaking onto hot engine components. Another common culprit is the oil filter cap; if it’s not secured properly, it can result in oil escaping, so always check that the cap is tightened to the manufacturer’s specifications. Additionally, leaks can occur from the oil pan gasket, especially in older models, which may require more extensive repairs. Regular inspections and timely maintenance, such as replacing worn gaskets and seals, can help prevent these issues from escalating. By being aware of these common problems and their symptoms, you can take proactive steps to diagnose and fix oil leaks, ensuring your BMW 335is remains in optimal condition.

How Urgent is an Oil Leak in a BMW 335is?

When dealing with an oil leak in your BMW 335is, understanding the urgency of the situation is crucial for maintaining your vehicle's health and performance. An oil leak can range from a minor nuisance to a critical issue that threatens the integrity of your engine. If you notice signs such as oil stains on your driveway, a burning smell, or a low oil level on the dipstick, it is essential to take these indicators seriously. Ignoring these symptoms can lead to severe engine damage, as a significant leak may result in insufficient lubrication, causing the engine to overheat or seize. Common culprits of oil leaks include worn gaskets and seals, which, if left unaddressed, can escalate into costly repairs. Therefore, if you suspect an oil leak, it is advisable to investigate and resolve the issue promptly to safeguard your engine and ensure the longevity of your BMW 335is.

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