5 Best Spark Plugs For Audi S5 Reviewed (2025)

When I first bought my S5, I quickly realized that if you want that supercharged or V8 engine to truly sing, routine maintenance is key—especially replacing the plugs. Finding the best spark plugs for audi s5 can feel overwhelming, given all the engine variants (3.0T vs. 4.2L). I’ve put together this hands-on guide covering options that deliver serious ignition power, improving throttle response and ensuring your German engineering runs flawlessly for years.

IMAGE	PRODUCT NAME	AMAZON LINK
	A-Premium Iridium Platinum Spark Plugs Compatible with Audi…	View on Amazon
	A-Premium Iridium & Platinum Spark Plugs Compatible with…	View on Amazon
	8 pc DENSO Iridium Power Spark Plugs compatible with Audi…	View on Amazon
	A-Premium Set of 4 Ignition Coil Pack and Iridium Spark…	View on Amazon
	Set of 4 Ignition Coil Pack and Spark Plugs Fits…	View on Amazon

A-Premium Iridium Platinum Spark Plugs Compatible with Audi Q5 2013-2017, Q7, A6 Quattro, A7 Quattro, A8 Quattro, S4, S5, SQ5 & Porsche Cayenne, Panamera & Volkswagen Touareg, 3.0L, Pack of 6

This A-Premium set is specifically engineered for the popular 3.0L supercharged engines found in many later model S5s and S4s (B8.5 chassis). Designed to match OEM specifications, these plugs offer incredible durability, utilizing both iridium and platinum metals to ensure longevity and stable performance up to 100,000 miles. If you’re looking for reliable plugs that you can install and forget about for years, these are an excellent choice for routine service. They provide exceptional ignitability, ensuring quick starts and smooth idling.

Key features that stand out:
* Engineered for Longevity: Recommended replacement intervals of 80,000 to 100,000 miles.
* Dual Metal Construction: Features an Iridium tip and Platinum core for enhanced durability.
* OE-Match Design: Designed alongside OEMs for maximum ignition performance in 3.0L supercharged engines.

Pros:
– Excellent lifespan means fewer replacements
– Strong performance matching factory specifications
– Ideal fitment for the widely used 3.0L V6 Supercharged motor (B8/B8.5 S5)
– Good value for a pack of six

Cons:
– Not designed for extreme high-performance tuning or forced induction upgrades.

Best for:
Daily driven Audi S5 models with the 3.0L Supercharged engine prioritizing reliability and long maintenance intervals.

Expert Opinion: These plugs are the workhorses of the 3.0T engine. They provide reliable, consistent spark necessary for keeping boost delivery smooth and maximizing fuel economy over the long haul.

A-Premium Iridium & Platinum Spark Plugs Compatible with Audi Q7 2007-2010, A6 Quattro 2007-2011, A8 Quattro 2007-2012, S5 2008-2012 & Volkswagen Touareg 2007-2009, 4.2L, Pack of 8

If you own an early S5 equipped with the magnificent, naturally aspirated 4.2L V8 engine (2008-2012 models), this pack of 8 is specifically tailored for your needs. Like the 3.0L version, these plugs utilize iridium and platinum electrodes, offering a balanced combination of efficiency and long life. The pack of eight correctly services the V8 engine, and you can expect reliable performance without the need for constant plug changes. They maintain the precise factory specifications required to avoid misfires in the high-revving 4.2L motor.

Key features that stand out:
* V8 Service Pack: Comes in a pack of 8, which is the exact count needed for the 4.2L V8 S5.
* OE-Match Specifications: Maintains tight factory tolerances for smooth engine operation.
* Durable Materials: Designed for longevity, similar to OEM platinum plugs.

Pros:
– Correct quantity for V8 4.2L engine
– Reliable and durable construction
– Suitable replacement for routine V8 maintenance
– Wide gap compatibility (0.031-0.035 IN)

Cons:
– Less focused on aggressive performance gains compared to Iridium-only options.

Best for:
Audi S5 V8 owners (2008-2012) seeking a cost-effective, long-life replacement for standard maintenance.

Expert Opinion: For the V8 S5, these plugs offer great stock performance. Since the V8 is more labor-intensive to service than the 3.0T, the 100k-mile lifespan is a massive benefit that saves shop time and money.

8 pc DENSO Iridium Power Spark Plugs compatible with Audi S5 4.2L V8 2008-2012

When maximizing performance and getting the sharpest throttle response are your goals, look no further than DENSO Iridium Power plugs. These are specifically designed for performance and power sports applications, featuring an ultra-fine 0.4mm Iridium tip that generates a much larger, more focused spark. This technology translates directly into improved power delivery and superior fuel economy, especially noticeable during aggressive driving. They are built to withstand temperatures greater than 4000 degrees, making them ideal for spirited driving and light tuning.

Key features that stand out:
* 0.4mm Iridium Tip: The smallest tip size available for maximum spark energy and efficiency.
* Performance Focused: Designed for high-heat and power applications.
* U-Groove Ground Electrode: Promotes better flame spread and improved ignitability.

Pros:
– Best choice for performance and quick throttle response
– Withstands extreme heat conditions
– Genuine DENSO quality parts
– Direct replacement fitment for V8 4.2L

Cons:
– While durable, they may not offer the same 100,000-mile service life as dual-platinum/iridium plugs.

Best for:
Enthusiasts with V8 4.2L S5s who prioritize maximum performance, responsive acceleration, and sharp ignition timing.

Expert Opinion: If you have any modifications or simply want to squeeze every bit of efficiency and horsepower from your naturally aspirated V8, these are the best spark plugs for audi s5 performance. They excel where quick, reliable ignition is critical.

A-Premium Set of 4 Ignition Coil Pack and Iridium Spark Plugs Compatible with Audi A4 A5 A6 A7 A8 Quattro Q5 Q7 R8 S4 S5 S6 S8 Porsche Cayenne Panamera Volkswagen

Sometimes, replacing just the plugs isn’t enough; aging coils can lead to frustrating misfires and hesitation. This A-Premium kit solves that problem by packaging four high-quality ignition coils alongside four iridium spark plugs. While the V8 4.2L S5 requires eight sets for a full change, this kit is perfect for replacing a single bank or refreshing half the engine, offering fantastic value. The iridium plugs included are designed for long life, stability, and improved fuel efficiency.

Key features that stand out:
* Comprehensive Kit: Includes both Ignition Coils (4) and Iridium Spark Plugs (4).
* Addresses Misfires: Ideal solution if you are experiencing coil-related engine hesitation or CEL codes.
* Bolt-On Installation: Coils are a direct replacement, simplifying installation.

Pros:
– Excellent value for money, combining plugs and coils
– Improves engine stability and reduces emissions
– Plugs feature high-quality Iridium+Nickel construction

Cons:
– V8 S5 owners must purchase two sets to service all eight cylinders.

Best for:
Audi S5 V8 4.2L owners needing a cost-effective ignition overhaul, especially if misfire codes indicate coil failure.

Expert Opinion: A lot of performance issues on older S5s are actually due to tired coil packs. Buying the full kit is smart preventative maintenance, especially since the coils are often replaced with the plugs anyway.

Set of 4 Ignition Coil Pack and Spark Plugs Fits for 2006-2016 Audi A3 A4 A5 A6 A7 Q5 Q7 R8 S4 S5 TT,for Volkswagen Jetta Golf Mk5 MK6 GTl MK6 Rabbit Passat Cc Tiguan,Replaces UF529

This kit offers a compelling package for many S5 owners, particularly those who have the 3.0T engine and want to upgrade their entire ignition system. The manufacturer claims the ignition coils use highly conductive copper wire to boost energy output by up to 15%, resolving common issues like engine hesitation and poor fuel economy. The accompanying spark plugs utilize iridium and platinum, ensuring both performance and durability. This is a great choice if you’re doing a preventative ignition overhaul.

Key features that stand out:
* 15% Energy Boost: Coils are designed to deliver higher energy output than standard OEM, improving combustion.
* Premium Materials: Iridium center electrode and platinum ground electrode on the spark plugs.
* Wide Vehicle Compatibility: Covers S5 3.0T and 4.2L (though remember cylinder count when ordering).

Pros:
– Significant claimed boost in ignition energy
– Addresses common CEL issues and poor idle
– Comprehensive warranty included

Cons:
– Only comes with four sets, meaning 1.5 sets (9 items) are needed for the 3.0T and 2 sets (8 items) for the 4.2L.

Best for:
S5 owners of various years needing a full ignition system refresh (coils and plugs) and wanting a slight performance edge over stock.

Expert Opinion: The idea of a 15% boost in energy is very attractive. For aging 3.0T models, replacing the coils is a must to keep that supercharger spinning smoothly, and this kit provides an excellent performance-minded solution.

Helpful Comparison Short Insights

When evaluating the best spark plugs for audi s5, your primary consideration must be engine compatibility (V8 4.2L vs. Supercharged 3.0L). The 3.0L engine requires only six plugs (PFR8S8EG reference), whereas the 4.2L V8 requires eight.

If you prioritize raw performance and have highly modified tunes, the DENSO Iridium Power is the top choice, especially for the V8, as its ultra-fine electrode delivers the most intense spark.

For reliability and a long service interval on the supercharged 3.0T engine, the A-Premium Iridium Platinum Pack of 6 (P1) is the standard bearer, promising up to 100,000 miles of trouble-free operation.

If you are experiencing misfires or hesitation and suspect old coil packs, the A-Premium Coil/Plug kits (P4 and P5) offer great value, significantly reducing the cost of an ignition system overhaul. Just be sure to purchase the correct number of sets to match your engine’s cylinder count (6 or 8).

Final Verdict: Choosing Your S5 Ignition Champion

Selecting the absolute best spark plugs for audi s5 depends entirely on what your car needs right now—longevity or raw performance.

The Daily Driver & Reliability Winner (3.0T Supercharged):
If you own the 3.0L S5 and want true OEM-level reliability and extended service life, the A-Premium Iridium Platinum Spark Plugs (P1) are unbeatable. They offer exceptional value and the reassurance of a 100,000-mile replacement window.

The Performance Enthusiast’s Choice (4.2L V8):
For the S5 V8 enthusiast craving sharp throttle response and maximum ignition intensity, the DENSO Iridium Power Spark Plugs (P3) are the clear winner. Their specialized design maximizes spark output for spirited driving.

Best Spark Plugs For Audi S5 FAQ

How often should I change the spark plugs in my Audi S5?

The recommended maintenance interval depends heavily on the type of spark plug installed. Standard OEM or high-quality platinum/iridium plugs (like those from A-Premium) are often rated for 80,000 to 100,000 miles. However, if your S5 is tuned or running higher boost pressures, performance plugs like DENSO Iridium Power should generally be inspected and replaced more frequently, often every 30,000 to 40,000 miles, to ensure optimal performance and prevent misfires.

What’s the difference between the 3.0T and 4.2L S5 engines regarding spark plugs?

The primary difference is the quantity and heat range. The 3.0T is a V6 engine and requires 6 spark plugs, typically with a specific heat range designed for the supercharged environment. The 4.2L is a V8 engine and requires 8 spark plugs. Always confirm the specific part number (like PFR8S8EG for the 3.0T) to ensure you have the correct heat range plugs for your motor.

Should I replace my ignition coil packs when changing the spark plugs?

While not always necessary, it’s highly recommended, especially on S5 models over 60,000 miles. Aging ignition coils are a common failure point in performance German vehicles and can lead to misfires, rough idle, and poor fuel economy even with brand-new plugs installed. Purchasing a kit that bundles the best spark plugs for audi s5 with new coils offers the best preventative maintenance.

Do I need to gap my new iridium spark plugs before installing them?

Most modern iridium or platinum spark plugs, particularly those designed for German applications like the S5, come pre-gapped from the factory and should require no adjustment. Attempting to gap fine-wire iridium tips can easily damage them. Always check the specific manufacturer recommendations (e.g., the factory gap for the 3.0T is around 0.032 inches), but generally, they should be installed as is.

Can using the wrong spark plugs cause misfires in my Audi S5?

Absolutely. Using plugs with the wrong heat range or improper gapping can lead to severe issues. If the plug runs too cold, it can foul; if it runs too hot, it can cause pre-ignition and engine damage. Always ensure your replacement set matches the OEM specification for your engine code, particularly when dealing with high-compression or forced induction motors.

What are the main benefits of choosing iridium over standard nickel plugs for the S5?

Iridium is one of the hardest metals, allowing for an incredibly thin central electrode tip. This thin tip requires less voltage to jump the gap, resulting in a more powerful, stable, and consistent spark. This improves fuel efficiency, provides better starting capability, and significantly extends the lifespan of the spark plug compared to traditional materials.