Used the Molabrew for some time then switched to straight Neutra. Its a great cleaner but seems to coat the os2 sensors and catalytic converts causing a engine code. Nothing serious but a call to Schaeffers confirmed that neutral should only be used as lead replacement , engine cleaner and fuel stabilizer. Just curious if anyone has tried using Schaeffer 131C Soy Ultra with FP60 plus as a fuel conditioner?