What Size Is the Oil Filter Socket on a 2015 Audi A3?

The oil filter cap on most 2015 Audi A3 models with the 1.8 TFSI or 2.0 TFSI engines typically uses a 32 mm oil filter socket (also sometimes listed as 1-1/4 inch), with a 6-point (hex) design. However, confirming by engine code and type (gasoline vs. diesel) is strongly recommended before purchasing tools.

Why Oil Filter Socket Size Matters on the 2015 Audi A3

The 2015 Audi A3 uses a cartridge-style oil filter housed in a plastic or composite cap, often mounted on top of the engine. To avoid cracking or rounding this cap, a correctly sized oil filter socket is crucial. An incorrect or improvised tool can lead to costly damage or a stuck filter cap during routine maintenance.

Typical Oil Filter Socket Size for 2015 Audi A3 (Gasoline Engines)

For most U.S. and European 2015 Audi A3 models equipped with the common gasoline TFSI engines, the oil filter housing is designed to be serviced with a specific size of socket. The specifications below reflect the widely used fitment for these engines.

Here are the commonly used specifications for the oil filter cap socket on 2015 Audi A3 gasoline models:

• Socket size: 32 mm
• Drive size: 3/8-inch or 1/2-inch drive (tool-dependent, not car-dependent)
• Style: Low-profile oil filter cap socket or standard 32 mm 6-point socket
• Cap type: Plastic/composite cartridge filter housing (top-mounted)
• Common engines: 1.8 TFSI and 2.0 TFSI (EA888 generation engines used in the A3)

These dimensions cover the majority of 2015 A3 gasoline models, meaning a 32 mm six-point socket is usually the correct choice for DIY oil changes on these engines.

Variations by Engine Type and Market

Not all 2015 Audi A3s use the same powertrains worldwide. Diesel variants and some market-specific models can have different oil filter housing designs, potentially requiring a different socket or even a different approach to oil filter removal.

Gasoline (Petrol) Models

Most 2015 Audi A3 gasoline engines share the VW Group’s modular design, which standardizes many service parts, including the oil filter housing. This leads to a relatively consistent tool requirement.

For the 2015 A3 gasoline lineup, the following generalizations apply:

• 1.8 TFSI (U.S./EU): Typically uses a 32 mm oil filter cap socket
• 2.0 TFSI (U.S./EU): Also typically uses a 32 mm oil filter cap socket
• Top-mount cartridge filter: The filter element sits inside the plastic housing accessed from the top of the engine bay
• Filter brand examples: Mann, Mahle, Hengst and OEM VAG filters all designed around this cap style

Because these engines share architecture with contemporaneous VW GTI, Golf, and other MQB-platform cars, the 32 mm socket has become something of a “standard” tool for DIYers servicing these models.

Diesel (TDI) and Regional Variants

Diesel versions of the A3 (where sold) may have a different oil filter layout and cap design, which can alter the exact tool needed. While many TDI engines also use a cartridge filter with a cap, dimensions can differ slightly.

When dealing with diesel or less common configurations, consider the following:

• Engine code check: Use your engine code (e.g., CUNA, CRLB, etc.) to verify socket size in a workshop manual or parts catalog
• Physical measurement: If you already have access to the cap, you can measure the hex with calipers before buying a socket
• Specialty tools: Some aftermarket tool kits list compatibility by engine code and model year, which helps eliminate guesswork
• Service manual: The official Audi/ESIS workshop documentation will list the required special tool number and dimensions

Because diesel and non-standard variants are more variable, verification by engine code or visual inspection is especially important for these models.

How to Confirm the Correct Socket Size for Your Specific A3

Even though 32 mm is widely correct for 2015 A3 gasoline engines, confirming the fit for your exact car protects you from buying the wrong tool or damaging the filter cap. A few straightforward methods can help you double-check the requirement.

These practical steps can help you verify the correct oil filter socket size before starting an oil change:

1. Check the owner’s manual or digital service information: Some manuals list the oil filter housing style and recommended tools, or at least the filter part number.
2. Look up the filter by VIN: Use your VIN on an OEM parts site or at a dealer to identify the exact oil filter housing and any associated special tools.
3. Inspect the existing cap: If possible, visually inspect the top of the oil filter housing; many caps clearly show a hex you can roughly size with a standard metric socket set.
4. Consult reputable parts catalogs: Brands like Mann, Mahle, or Hengst often provide technical drawings of the filter and cap interface, indicating the hex size used.
5. Ask an Audi specialist or dealer: A service advisor or parts counter staff can confirm the socket size based on engine code and build data.

Using at least one of these verification methods ensures that you match the tool to your exact vehicle configuration rather than relying solely on generic fitment lists.

Tool Recommendations and Best Practices

Once you know that a 32 mm socket is appropriate for your 2015 Audi A3, choosing the right style of socket and using it correctly will make the job safer and cleaner. Because the cap is usually plastic and subject to heat cycling, correct torque and fitment matter.

These guidelines can help you select and use an oil filter socket effectively on the A3’s filter housing:

• Use a 6-point socket: A 6-point (hex) design grips the cap flats more securely than a 12-point, reducing the risk of rounding the corners.
• Prefer a low-profile oil filter cap socket: Special low-profile sockets designed for oil filter caps provide better clearance in tight engine bays.
• Pair with a torque wrench: The filter cap has a specified torque (typically around 25 Nm / 18 lb-ft for many VW/Audi plastic caps, but check your spec) and should not be overtightened.
• Avoid adjustable wrenches or strap wrenches on plastic caps: These can crush or deform the cap, leading to future leaks or difficulty removing it.
• Inspect and replace the O-ring: Always replace the cap’s O-ring seal and lightly oil it before reinstallation to avoid pinching or tearing.

By pairing the correct 32 mm 6-point socket with careful torque application and proper seal replacement, you significantly reduce the likelihood of leaks, stripped caps, or future service issues.

Why 32 mm Is So Common Across VW–Audi Engines

The recurring 32 mm socket size on VW–Audi gasoline engines from this era is not random; it stems from a standardized approach to component design within the VW Group. This standardization benefits both dealers and independent mechanics.

The following points explain the prevalence of this socket size among related models:

• Shared platform (MQB): The 2015 Audi A3 shares much of its drivetrain architecture with the VW Golf, GTI, and other MQB vehicles, which use similar filter housings.
• Streamlined service tools: Using a single cap dimension across multiple models reduces tooling complexity in workshops.
• Supplier standardization: Filter suppliers can design interchangeable elements for multiple brands, lowering costs and simplifying stock management.
• Consistent service procedures: Technicians can apply a familiar procedure and torque specification across a range of engines with minimal variation.

This standardization means that if you already own a 32 mm oil filter cap socket for a contemporary VW or Audi, it is very likely to fit the 2015 A3 gasoline models as well.

Summary

For most 2015 Audi A3 models equipped with the common 1.8 TFSI or 2.0 TFSI gasoline engines, the oil filter cap is designed to be removed with a 32 mm, 6-point socket, often in a low-profile oil filter cap style. While this size is widely correct, owners of diesel or region-specific variants should confirm by engine code, VIN-based parts lookup, or direct inspection before purchasing tools. Using the correct 32 mm socket, paired with a torque wrench and proper O-ring replacement, ensures safe, clean, and repeatable oil filter service on the 2015 Audi A3.

What size is the Audi oil filter socket?

VW Audi Oil Drain Tube 36 mm oil filter socket Petrol engines 1.8 2.0 TSI TFSI. Special designed release adapter allows to drain the filter before removing the housing – NO SPILLAGE!

What size oil filter socket do I need?

The correct oil filter socket size depends on your vehicle, so you must first determine the specific filter’s size. You can find the correct size by checking your vehicle’s owner’s manual, looking up the part number online, or physically measuring the filter with a caliper or ruler. Some common sizes, such as 32mm, may fit certain vehicles like some VW TDIs, but it’s essential to confirm the exact size for your car to ensure a proper fit.
 
This video explains different types of oil filter wrenches, including those that use sockets: 1mYour Home GarageYouTube · Oct 11, 2021
How to determine the correct socket size

• Check your owner’s manual: This is the most reliable method to find the exact oil filter size and the specific wrench needed for your vehicle. 
• Measure the filter: If you don’t have the manual, use a caliper or ruler to measure the outside diameter of the oil filter. You can then use this measurement to find a compatible wrench. 
• Look up the filter part number: Search online for the correct oil filter part number for your car’s make, model, and year. This will often lead to information on the required socket size. 
• Use a universal wrench: If you work on multiple cars, a universal or adjustable oil filter wrench may be a good investment, as it can adapt to various sizes. 

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Product specifications

Part Number	‎AU1010A
Size	‎32mm
Finish	‎Powder Coated
Batteries Required?	‎No
Finish Type	‎Powder Coated