Video: 2018 Audi S5 3.0T Full Engine Swap – No Job Too Big at PROFIX Auto Repair in Norman
Thorough Diagnosis and Full Engine Swap on a 2018 Audi S5 3.0T Supercharged Engine
At PROFIX Auto Repair in Norman, OK, no job is too big. We recently completed a full engine swap on a 2018 Audi S5 equipped with the 3.0T supercharged engine. The customer brought the car in with a flashing check engine light, sluggish performance, and a noticeable rough idle. Despite new spark plugs and a coil on cylinder 6, the issue remained. This job is a great example of the kind of complex European performance repairs we handle regularly at our shop.
From routine maintenance to major engine work, our team has the experience, tools, and facility to take on whatever comes through the door — no job is too big or too involved.
Thorough Diagnosis
We started with a full diagnostic scan and live data monitoring. This quickly confirmed an active misfire on cylinder 6. A compression test provided the critical numbers: cylinder 6 measured only 124 psi, while the other cylinders sat at a healthy 198 psi. For this engine, the minimum specification is 145 psi with a maximum allowable difference of 43.5 psi between cylinders. Cylinder 6 was clearly outside those parameters.
Next, we performed a borescope inspection of cylinder 6. The images showed slight scoring on the cylinder wall and carbon buildup on the valves. These findings, combined with the compression loss, made it clear that a simple repair — such as replacing injectors, rings, or attempting a partial rebuild — would not deliver a reliable long-term solution.
We documented everything step by step and conducted an additional borescope check for confirmation so the customer had a complete picture. After reviewing the results, we recommended proceeding with a full engine replacement.
The Engine Swap Process
We began the main repair by removing the original engine and installing a fresh replacement unit. The B9-generation S5 has a very tightly packaged engine bay, and this is a labor-intensive job that requires careful disassembly and reassembly of multiple systems.
Technician Mark led the work, which included:
- Complete removal and replacement of the engine
- Installing an intercooler
- Transferring all accessory components, wiring harnesses, intake manifold, exhaust manifold, turbo setup, and supporting systems
- Installation of a full gasket set
- New Audi thermostatic valve O-rings, seal rings, washers, and oil return line
- Replacement of all six NGK spark plugs
- Full engine oil and filter service
- Complete coolant system air purge
The shop video captures the job in progress and shows the level of organization we maintain even during major repairs. Two complete 3.0T long blocks sat on our heavy-duty engine cart throughout the process — one coming out, one going in.
Why a Full Engine Swap Was the Right Decision
The 3.0T engine in the S5 is a powerful, high-performance unit when healthy. However, once you see low compression combined with cylinder wall scoring and carbon issues, piecemeal repairs often lead to the same problems appearing again later. Installing a complete engine ensured even compression across all six cylinders and restored the vehicle's full performance and reliability.
The customer also took this opportunity to have an intercooler upgrade during the swap, which will help with consistent power delivery and efficiency.
This approach gives the owner confidence that the car is back to the level of performance an S5 should deliver — smooth, strong, and ready for daily driving and spirited runs.
What We Handle at Our Shop
Jobs like this full engine swap demonstrate the range of work we’re equipped to perform. We regularly service and repair Audi, Volkswagen, and other European performance vehicles. Our technicians are experienced with the unique challenges these cars present — from complex electronics and tight engine bays to the specialized tools and procedures required for proper repairs.
We don’t just fix symptoms. We focus on getting the job done correctly the first time so customers aren’t back with the same issue months later. Whether it’s a check engine light, suspension work, transmission replacement, or a major engine replacement, we can handle it.
Advice for Audi S5 / S4 Owners
If your 3.0T Audi starts showing misfire codes — especially on cylinder 6 — don’t ignore it or just replace ignition components. Have a proper compression and leak-down test performed early. Catching issues before they worsen can sometimes avoid a full engine replacement. When mechanical damage is already present, a complete engine swap is often the most cost-effective and reliable path forward in the long run.
Sticking to the manufacturer’s recommended oil specification, changing oil on schedule, and using quality fuel are some of the best ways to prevent carbon buildup and keep these engines running strong for many miles.
No Job Too Big or Too Small
This 2018 Audi S5 is now back on the road with a fresh engine and should provide reliable, enjoyable performance for years to come. Projects like this are exactly why customers bring their vehicles to us.
If your vehicle is throwing codes, running rough, making unusual noises, or just due for service, we’re here to help. We provide honest diagnostics and professional repairs on everything from daily drivers to high-performance Audis.
If you’re dealing with check engine lights, misfires, or any other issues with your Audi, VW, or other performance vehicle, don’t hesitate to reach out. Bring it to Profix Auto Repair in Norman. —We'll give you a straight diagnosis and get the job done right. No repair is too big for our team.
PROFIX Auto Repair – West
1121 Rambling Oaks Dr
Norman, OK 73072
📞 (405) 310-2279
🕒 Monday–Friday: 7:30 AM – 5:00 PM
Leon’s PROFIX Auto Repair – East
521 N Porter Ave
Norman, OK 73071
📞 (405) 364-2799
🕒 Monday–Friday: 7:30 AM – 5:00 PM
Email Us:
