Liqui moly 4012 valve protection for natural gas vehicles 1l liqui moly 4012 p align left this valve protection for natural gas vehicles 1l from liqui moly has been developed for gas powered vehicles cng lpg and protects the valves in the engine absorbing peak temperatures optimal lubrication and clean combustion contribute to avoiding expensive repairs and engine damage p liqui moly 4012 valve protection for natural gas vehicles 1l