Early generation 2.0T Gen3 engines rely on a single hose connection to the turbo inlet pipe to create a slight vacuum to draw out crankcase vapors. This vacuum source can be significantly affected by aftermarket turbo inlet pipes, leading to incorrect PCV diaphragm operation, which can exacerbate oil consumption and pressure issues.
The MK8 system (when used as a retrofit) introduces a second connection (the venturi hose) that connects to the turbocharger outlet. This secondary vacuum source is more effective at drawing out crankcase pressure, especially under high-load conditions. The venturi effect also helps ensure the PCV diaphragm stays properly closed under boost, maintaining better crankcase vacuum even when running aftermarket turbo inlet pipes, which are known to interfere with the effectiveness of the stock MK7 PCV.
The MK8 Golf R PCV (Positive Crankcase Ventilation) valve offers several key benefits and design improvements over the MK7 version, making it a popular retrofit for MK7 GTI, Golf R, and 8V A3/S3 owners
The main benefits of the MK8 PCV system include:
Improved Reliability: The MK8 design is generally considered less prone to failure than the MK7 PCV system, especially in high-performance or tuned applications.
Better Crankcase Ventilation: It provides more robust crankcase pressure regulation, especially under boost, which is ideal for tuned engines or track use.
Reduced Oil Blow-By and Ingestion: The design improvements help to prevent oil vapor from entering the intake system more effectively, which reduces oil consumption and the potential for carbon buildup on the intake valves.
Boost Leak Prevention: The MK8 system is considered more robust under boost pressure, helping to eliminate annoying PCV-related boost leaks often found in highly tuned MK7 setups.
Unsure if this kit will work for you?
On an IS38-equipped vehicle, or if you would like to keep the original IS12/IS20 (Excluding the 2022+ Jetta GLI, and 2021-2023 Atlas/Altas Cross Sport) ES#3610622 would be required to do this upgrade, which is the 034Motorsport Turbo Muffler Delete With Test Ports. This turbo muffler allows you to add a Barb fitting to accommodate the dual PCV hose included in this upgrade kit
Customers with an IS20 that needs to be replaced, or looking to upgrade to an IS20 from an IS12, can purchase IS20 Turbo Part number 06K145689D. This would be the IS20 found on the 2022+ Jetta GLI, and 2021-2023 Atlas/Atlas Cross Sport, which uses the same dual-hose style PCV system found on the MK8/8Y Evo4 engines. For this reason, 06K145689D has an additional Port found on the muffler housing, which eliminates the need for the 034Motorsport turbo muffler delete
If 06K145689D is being used, the original turbo muffler is suggested. Aftermarket Muffler deletes would block off the flow to the port found on this turbo, which defeats the purpose of the upgrade.
Not for sale or use in the state of California on any pollution-controlled vehicle as per the California Air Resources Board.
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Products are warrantied by their manufacturer. Eurosport Performance is an authorized reseller: every part we sell is covered by the manufacturer's own warranty, with its own terms and duration. Claims go through us, so you deal with Eurosport Performance rather than a form on the brand's site, but whether a claim is accepted is the manufacturer's decision.
Manufacturer terms apply Duration and coverage are set by the brand and differ from one to the next: some cover one year, some a lifetime, some only the original purchaser. The brand's warranty page is the reference; ask us if you cannot find it. | We file the claim for you Contact us with your order number, photos and a description of the issue. We open the claim with the manufacturer, follow it up, and arrange the repair, replacement or credit they approve. The manufacturer decides whether the claim is accepted. |
Fitment guarantee: North America only We guarantee fitment for vehicles sold in the North American market. Vehicles from other markets are out of scope; specifications differ, and it is the customer's responsibility to confirm compatibility before ordering. | No warranty on tuning files ECU and TCU tunes and other software files are sold without warranty and are not returnable once delivered or flashed. Tuning can affect your vehicle's factory warranty; please read the brand's terms before purchasing. |
Proof of purchase Your Eurosport Performance order is the proof of purchase every manufacturer asks for. Keep the order confirmation; it is also in your account on the site and in the SPECD app. | What is usually not covered Damage from improper installation, modification, abuse, racing or an incorrect application for the vehicle, and normal wear items such as pads, clutch discs and filters. Shipping and labour are covered only when the manufacturer's terms say so. |
It is the manufacturer's warranty for that product. Where the brand publishes it, we note it in the description; otherwise contact us before ordering and we will confirm the exact terms with them.
Stop using it if it is a safety-related part, then contact us with your order number, clear photos, and when and how the issue appeared. Do not return anything until we confirm the claim; manufacturers often require an inspection or an authorization number first.
The manufacturer. We prepare and submit the claim, provide the proof of purchase and push for a fair outcome, but acceptance, replacement or credit is their call under their terms. We pass their decision on to you as soon as we have it.
It depends on the manufacturer. Simple cases are approved in days; claims that need the part inspected can take a few weeks. We keep you updated at each step and push when it drags.
No. Tuning files are software; once delivered or flashed they cannot be returned, and they carry no warranty from Eurosport Performance or, in most cases, from the tuner. Support for the tune itself (revisions, flashing questions) comes from the tuning brand under its own terms.
No. Our fitment guarantee covers vehicles sold in the North American market only. European, Japanese and other market vehicles can differ in engines, electronics and dimensions, and a part listed for the North American model is not guaranteed to fit. If you order for one of these vehicles, confirming compatibility is your responsibility, and fitment issues on such vehicles are not covered by returns or warranty.
Labour is not covered unless the manufacturer's terms specifically include it. Having the part installed by a qualified shop protects your claim: improper installation is the most common reason a manufacturer declines.
No. Returns cover unused parts you no longer want, under our refund policy. Warranty covers a part that fails in use, under the manufacturer's terms. If you are unsure which applies, contact us and we will point you to the right one; please do not open a bank dispute, as it pauses both processes.
Questions about coverage before you buy? Email us with the product and your vehicle and we will confirm the manufacturer's terms.
