Marvel Mystery Oil for fogging

[tommer12]

I have fogged my Holley carbed Nautiques over the years with Marvel Mystery oil and it works great. Pour it down the throttle body and smoke it and then cut it. With the PCM on the new Nautiques, does anyone do this or will it mess with the EFI? Im old school and was not sure if you could do this or not with the newer engines. It saves a ton of time and is much better on the cylinders than fogging oils.

[DaveNH]

Don't fog an efi engine through the intake, it will cause problems. Pull the spark plugs and squirt or spray a bit of oil in, replace plugs and turn it over a few times without starting. I've used light engine oil like 5W20 or more recently aerosol fogging oil. I'm sure Marvel is fine for it as well. I switched to the aerosol in recent years but just squirted from an oil can for many years as well.

[tommer12]

I figured, but was hoping there was a magic trick to these PCM 330s. Pulling the plugs on these are a pain.