DIY intake valve cleaning tips/advice, please. - BMW 3-Series (E90 E92) Forum
Intake Valve Carbon Cleaning – Paul's Motor Car Service
Nates Interactive Auto on X: "Crc intake valve cleaner & seafoam vs a direct injection engine! Carbon buildup intake valve cleaning battle of the titans with a GDI engine. Watch video click
CRC Industries' GDI IVD Intake Valve & Turbo Cleaner to Debut at 2016 AAPEX and SEMA Shows | Business Wire