What Size Is the Oil Drain Plug on a 2014 Audi S4?

The oil drain plug on a 2014 Audi S4 (B8/B8.5, 3.0T V6) typically uses an M14x1.5 plug that is removed with a 19 mm hex socket, though exact specifications can vary slightly by pan design and market, so confirming on the vehicle or via VIN is recommended.

Understanding the 2014 Audi S4 Oil Drain Plug

The 2014 Audi S4 uses the supercharged 3.0-liter V6 (engine code variants like CGXC/CREC), and most of these engines are equipped with a steel or aluminum oil pan using a conventional threaded drain plug. Owners often ask about the exact plug size when planning DIY oil changes or replacing a worn or stripped plug, and getting this right is key to avoiding leaks or damage.

Core Specifications of the Drain Plug

The most relevant details are the thread size, the tool size needed to remove it, and the sealing method. While different catalogs may list aftermarket alternatives, the basic dimensions are consistent across most 2014 S4 models.

Thread Size and Type

For most 2014 Audi S4s sold in North America and Europe, the factory oil drain plug uses a standard metric thread commonly shared with other VAG 6‑cylinder engines of the same era.

The following list outlines the key thread and design characteristics of the 2014 Audi S4 oil drain plug:

• Thread diameter: M14 (14 mm outside diameter)
• Thread pitch: 1.5 mm (M14x1.5)
• Thread type: Metric, standard right-hand thread
• Material (OE-style): Typically steel, zinc-coated or similar corrosion-resistant finish
• Sealing style: Crush/sealing washer (often aluminum or copper) or integrated captive washer, depending on the part

These dimensions mean any replacement plug advertised as M14x1.5 for Audi/VW V6 applications will usually be compatible, provided it is the correct length and uses the right sealing arrangement recommended for the S4’s oil pan.

Socket/Tool Size

While the thread spec tells you what plug fits in the pan, DIY owners also need to know which tool removes it. The OEM and OE-equivalent plugs for the 2014 Audi S4 generally share the same head size.

The following points summarize the most common tool requirements for removing the oil drain plug on a 2014 S4:

• Head type: Hex bolt head (external hex, not an internal Allen on most factory plugs)
• Common socket size: 19 mm
• Drive tool: 3/8″ or 1/2″ drive ratchet with 19 mm socket
• Occasional variation: Some aftermarket plugs may use 17 mm or 18 mm heads, but the factory-style plug is typically 19 mm

In practical terms, a 19 mm socket will fit the majority of factory and OE-style replacement plugs used on the 2014 S4; however, if a prior owner fitted an aftermarket plug, checking the head with a wrench before starting is wise.

OEM vs. Aftermarket Drain Plug Options

Many owners wonder whether to buy a genuine Audi plug or an aftermarket equivalent. Both can work, but the choice affects materials, washer design, and sometimes tool size.

Genuine Audi/VW Part Numbers and Characteristics

Exact part numbers can vary by production date and oil pan design, but Audi and VW use a family of M14x1.5 drain plugs across multiple models. Most 2014 S4s share a standard plug with other EA837 3.0T engines.

Key details about typical genuine-style drain plug and washer options include:

• Thread spec: M14x1.5 (consistent with factory pan)
• Head size: 19 mm external hex on common OE plugs
• Washer type: Single-use crush washer (often aluminum), supplied separately or pre-attached depending on part
• Design intent: One plug reused a few times with a new crush washer each oil change, or replaced periodically if worn
• Torque spec (typical range): Around 30–40 Nm (22–30 lb-ft); exact figure should be verified in the factory service manual for your specific engine/pan

Because Audi occasionally revises part numbers, the most reliable way to confirm the exact OE part is to check with a dealer or trusted parts source using your VIN, which ensures compatibility with your specific production batch and oil pan casting.

Aftermarket and Magnetic Drain Plug Options

Enthusiasts sometimes upgrade to a magnetic drain plug or an aftermarket version for easier sourcing or perceived added protection against metal debris.

The list below highlights common aftermarket options and considerations for a 2014 Audi S4 drain plug:

• Magnetic plugs: M14x1.5 magnetic drain plugs designed for Audi/VW 3.0T engines, intended to capture fine metal particles
• Integrated washer designs: Some aftermarket plugs have built-in, non-removable sealing rings, eliminating separate crush washers
• Alternative head sizes: Certain brands switch to 17 mm or 18 mm hex heads; the thread is the same but the socket you need changes
• Material upgrades: Options in stainless steel or higher-grade coatings for corrosion resistance
• Fitment caution: Length and washer seat must match Audi’s oil pan design to ensure proper sealing and avoid interference inside the pan

As long as you choose an M14x1.5 plug specifically listed for the B8/B8.5 S4 3.0T, aftermarket magnetic or upgraded plugs can work well, provided they come from a reputable manufacturer and you still follow the correct torque spec.

Practical Tips for Servicing the Drain Plug

Knowing the size is only part of a safe, leak-free oil change. The way the plug is handled, torqued, and inspected can significantly affect the longevity of both the plug and the oil pan threads.

Best Practices When Changing the Oil

DIY owners can reduce the risk of stripped threads and future leaks by following a few basic guidelines around the drain plug on a 2014 Audi S4.

The following practices are recommended whenever you remove the oil drain plug:

• Use correct tools: A good-quality 19 mm socket that fully engages the head, plus an appropriate-length ratchet
• Replace the crush washer: Install a new aluminum or copper washer at each oil change if your plug uses a separate washer
• Hand-start the plug: Thread it in by hand first to avoid cross-threading in the aluminum pan
• Use a torque wrench: Tighten to the factory-specified torque rather than “by feel”
• Inspect for leaks: After refilling and running the engine briefly, check the drain area for any oil seepage

Following these steps not only protects the threads in the pan—an expensive component to repair—but also helps ensure that your 2014 S4 remains free of slow oil leaks that can go unnoticed for some time.

When to Replace the Drain Plug

While the plug is designed to be reused, there are clear signs that it should be replaced rather than reinstalled during an oil change.

Consider replacing the drain plug on a 2014 Audi S4 if you notice any of the following conditions:

• Rounded head: The hex head is partially stripped and the socket slips under load
• Damaged threads: Visible burrs, flattening, or distortion on the plug’s threads
• Persistent leaks: Oil seepage continues after installing a new washer and using proper torque
• Corrosion: Heavy rust or corrosion on the plug body or seating surface
• Past overtightening: Known history of overtightening that may have stressed the plug

Replacing a suspect plug is inexpensive insurance compared to the cost and complexity of repairing an oil pan with damaged threads, particularly on a performance-focused model like the S4.

Summary

For a 2014 Audi S4 equipped with the 3.0T V6, the oil drain plug is generally an M14x1.5 threaded plug, most often removed with a 19 mm hex socket and sealed using a crush washer. While minor variations can exist depending on exact pan design and prior modifications, this is the standard configuration across the model. Confirming via VIN or directly inspecting the plug on your car is always wise, especially if you suspect an aftermarket or non-standard part. Proper tools, a new washer, and adherence to the correct torque specification are essential to ensure a clean, leak-free oil change and long-term reliability of the oil pan threads.

What size is an Audi drain plug?

Product Information. NOTE: We strongly recommend when performing your oil change service to replace the engine oil drain plug. Specs: M14 x 1.5.

What size is the drain plug on a 2014 Audi s4?

0.74 “
Dorman – Standard Engine Oil Drain Plug: M14-1.50 Thread, 0.74 ” Head, 1 Pack (Part No. 921-131)

What size is the oil filter socket on a 2013 Audi s4?

36mm 6-Point Oil Filter Socket – 3/8″ Drive.

What size socket is the oil drain plug?

There is no single socket size for all oil drain plugs, as it varies by vehicle, but common metric sizes are 13mm, 14mm, 15mm, 17mm, and 19mm. To find the correct size, check your vehicle’s owner’s manual or a set of assorted metric sockets if unsure. 
This video shows how to use different tools to remove an oil drain plug: 1mOn The WorkbenchYouTube · Nov 1, 2024
Common sizes

• Metric: The most common sizes for passenger vehicles are between 13mm and 17mm. 
• SAE: Some older or specialty vehicles may use SAE (inch) sizes, which are often fractional (e.g., 3/8″ or 1/2″). 
• Specialty: Some plugs might have a square opening, a hex (Allen/Allen key), or a Torx (star) shape instead of a traditional bolt head. 

How to find the right size

1. Check your owner’s manual: This is the most reliable source for your specific car. 
2. Use a socket set: Start with common sizes like 13mm, 14mm, 15mm, and 17mm. A 6-point socket is best as it grips the bolt head more securely. 
3. Visit an auto parts store: You can tell them your vehicle’s make and model, and they can look up the correct size. 
4. Try a universal set: If you frequently change the oil, consider buying a specialized oil drain plug socket set that includes common metric and SAE sizes. 

This video explains the importance of using the correct tool to remove an oil drain plug: 1mYour Home GarageYouTube · Nov 24, 2022