Carbon build-up is an issue on direct injection engines. There is a lot of speculation online that talks about methods that work to fix or prevent carbon build-up. We actually do a real-world test using an intake manifold service to compare before and after results. We also cover alternative methods and offer a perspective on how viable these are as solutions. Links Talked about in this video Berryman Intake Valve Cleaner Used in this Video https://www.amazon.com/gp/product/B081TKBG18?ie=UTF8&tag=thenapgri-20&camp=1789&linkCode=xm2&creativeASIN=B081TKBG18 Carbon Build up on Direct Injection Engine (Intake Valves) AKA GDI Gasoline Direct Inection https://www.youtube.com/watch?v=PS8riAae_bM Don't Overpay for a MK7 Waterpump and How to do it Yourself https://www.youtube.com/watch?v=RIVyvfEWztc How Much Carbon Build Up at 10,000 Miles?? ~ 2019 Golf R https://www.youtube.com/watch?v=CB5ThYfX7ag Racingline Catch Can DIY | MQB MK7.5 GTI https://www.youtube.com/watch?v=DGoSUSIfiDc 0:00 Introduction to Carbon Build Up 0:46 Port Injection V.S. Direct Injection 2:44 Why Carbon Build Up Happens 4:45 Common Preventives for Carbon 5:14 Italian Tune-ups 6:21 Intake Manifold Services 8:30 Testing an Intake Manifold Service 10:46 Intake Manifold Service Results 13:33 Do Catch Cans Help Carbon? 14:43 Water Methonal Injection and Carbon 16:25 Conclusion --------------------------------------------------- This Video was shot at our VW and Audi Specialty Shop DAP Repair 10308 Bailey Rd Suite 408 Cornelius NC 28031 https://goo.gl/maps/emANaqp9dMk?entry=yt Shop for VW and Audi Parts Here http://shopdap.com/ ---------------------------------------------------- VW AUDI Specialty Repair Cornelius NC https://www.daprepair.com/vw-repair-cornelius-nc/ VW AUDI Specialty Repair Kent Ohio https://www.daprepair.com/vw-repair-akron-ohio/ ---------------------------------------------------- More info on DAP Reward Credit https://shopdap.com/store/rewardpoints/index/policy/