Vorsprung GLT™ TruSeal PCV Valve Diaphragm Upgrade, Audi 3.2L, 3.6L, and 3.0T PCV Relocation
Vorsprung GLT™ TruSeal PCV Valve Diaphragm Upgrade – Audi 3.2L & 3.6L - 3.0T PCV Relocation Upgrade
The last PCV diaphragm you will ever need to install.
The factory PCV (Positive Crankcase Ventilation) diaphragm on Audi 3.2L and 3.6L engines is notorious for failing. When it does, the standard dealership solution is to force you to buy an entirely new valve cover assembly, a massively expensive and unnecessary repair. At Vorsprung Autowerk, we don't just replicate factory parts to temporarily patch the problem; we engineer out the flaws so you only have to fix it once.
The Problem: The "Brittle Tear" Failure
The OEM PCV diaphragm lives in a harsh environment, subjected to constant rapid movement, extreme engine heat, and highly corrosive oil and fuel vapors. Factory diaphragms are manufactured from standard commercial-grade rubber that inevitably degrades. As it ages, and especially when exposed to cold temperatures, the factory rubber hardens, becomes brittle, and eventually tears.
When this membrane ruptures, it creates a massive internal vacuum leak. The results are immediate: a high-pitched whistling sound from the engine bay, violent rough idling, stalling, and a dashboard lit up with Check Engine Light (CEL) codes (such as P0171, P0507, or P2279).
The Solution: Viton™ GLT Technology
A diaphragm's sole job is to flex. If it loses its elasticity, it fails. We have upgraded the industry standard by manufacturing our replacement diaphragms exclusively from Viton™ GLT, a premium aerospace-grade fluoroelastomer designed to solve the fatal shortcomings of standard rubber.
Unlike standard FKM, which becomes stiff and brittle at -4°F (-20°C), the Vorsprung GLT™ diaphragm remains fully flexible, elastic, and responsive down to -40°F (-40°C). Whether you are dealing with a sub-zero cold start in the dead of winter or sitting in stop-and-go summer traffic, this membrane will continually regulate crankcase pressure without hardening or tearing.
Engineered for Lifetime Performance
We spec our GLT material to provide the perfect balance of tensile strength and extreme flexibility. It possesses total immunity to synthetic engine oils, blow-by gases, and fuel vapors that eat away at factory rubber. By replacing just the failed diaphragm with our aerospace-grade upgrade, you save hundreds of dollars over a new valve cover while permanently bulletproofing your PCV system.
Symptoms Resolved:
- High-pitched whistling or howling noise from the valve cover
- Rough, erratic, or surging idle
- Excessive vacuum pulling on the oil cap (hard to remove while running)
- System Too Lean (P0171) or Idle Control System RPM Higher than Expected (P0507) codes
- Random engine misfires due to unmetered air
Key Specifications
- Material: Genuine Chemours Viton™ GLT (Low-Temperature FKM)
- OEM Matched: Molds made from the original OEM part for an exact fit
- Temperature Range: -40°F to +400°F (-40°C to +204°C)
- Chemical Resistance: 100% immune to synthetic engine oils, fuel vapors, and crankcase acids.
- Lifespan: Engineered to outlast factory seals by 2-5x (Estimated 15+ years)
- Cost-Effective: Replaces just the failed diaphragm, eliminating the need to buy a complete OEM valve cover assembly.
Vehicle Fitment
This diaphragm is a direct OE-fit replacement for the Audi 3.2L V6 (A4/A5/A6, B8/C6, and Q5 8R) and 3.6L V6 (Q7, 4L), and also serves as a PCV relocation component on the 3.0T EA837 supercharged platform.
| Make | Model | Chassis | Engine | Application |
|---|---|---|---|---|
| Audi | A4 / A5 / A6 | B8 / C6 | 3.2L V6 | Direct OE Fit |
| Audi | Q5 | 8R | 3.2L V6 | Direct OE Fit |
| Audi | Q7 | 4L | 3.6L V6 | Direct OE Fit |
| Audi | S4/S5/Q5/SQ5/A6/A7/A8/Q7 | B8/B8.5/C7/C7.5/D4/4L/4M | 3.0T V6 Supercharged | PCV Relocation Component |
S5 / A5 NOTE: 2010-2012 fitment is the S5 Cabriolet only (the 2008-2012 S5 coupe has the 4.2 V8). The A5 was never sold with the supercharged 3.0T in North America; the European-market B8.5 A5 3.0 TFSI (2012-2016) uses the same EA837 engine, so confirm your engine code before ordering.
NOTE: On the 3.0T supercharged platform, this diaphragm is a component used in a PCV relocation build, not a stand-alone bolt-in for the factory location. Confirm your engine code before ordering.
TruSeal PCV Diaphragm FAQ
How do I know if my diaphragm has failed?
Common symptoms include a high-pitched whistling or howling noise from the valve cover, rough or surging idle, excessive vacuum pulling on the oil cap, and codes like P0171, P0507, or P2279.
Do I need to replace the whole valve cover?
No. This upgrade replaces just the failed diaphragm, molded from the original OEM part for an exact fit, so you skip the cost of a complete valve cover assembly.
Will this hold up in cold weather?
Yes. The Viton GLT material stays flexible down to -40°F, unlike standard FKM which stiffens and can crack around -4°F.
Does this fit my 3.0T supercharged S4/S5?
On the 3.0T supercharged platform, this diaphragm is used as a component in a PCV relocation build rather than a direct factory-location replacement.
How long will this last?
It's engineered to outlast factory seals by 2-5x, with an estimated lifespan of 15+ years.
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Shop More Parts for Your Audi
Browse every Vorsprung part for your chassis: Audi S4 & S5 B8/B8.5 parts · Audi A6 & A7 C7/C7.5 parts · Audi A8 D4 parts · Audi Q5 & SQ5 B8/B8.5 parts · Audi Q7 4L/4M parts. Or see all Audi 3.0T performance parts.
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Vorsprung GLT™ TruSeal PCV Valve Diaphragm Upgrade, Audi 3.2L, 3.6L, and 3.0T PCV Relocation
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FAQs
Please read our FAQs page to find out more.
Are OEM products more expensive than aftermarket alternatives?
OEM products might have a higher upfront cost compared to aftermarket parts, but their superior quality and durability often make them a more cost-effective choice over time. Investing in OEM ensures you’re getting parts specifically designed for your vehicle, which can lead to better performance and longevity.
Can I purchase OEM parts online or do I need to visit a dealership?
You don’t need to visit a dealership to get OEM parts. You can conveniently purchase genuine OEM components from authorized distributors and reputable online retailers like Turbo Tech Performance. Our online store provides a wide selection of high-quality parts delivered straight to your door.
Are parts from brands like Mopar, ACDelco, and Motorcraft interchangeable between different vehicle brands?
No, parts from Mopar, ACDelco, and Motorcraft are typically designed for specific vehicle brands. It’s crucial to ensure compatibility with your vehicle’s make and model by checking part numbers and consulting with a knowledgeable expert.
Can I install OEM parts myself, or is it better to have a professional handle it?
While some OEM parts can be installed by DIY enthusiasts, the complexity of installation can vary. For the best results and to ensure proper fitment and performance, we recommend having a trained mechanic install the parts, especially if you’re unfamiliar with automotive repairs.
Do OEM parts come with a warranty?
Yes, many OEM auto parts come with a manufacturer’s warranty that covers defects or issues. Be sure to check the warranty details for each part at the time of purchase, and keep your receipt for any potential warranty claims.