Is it ok to shut down my 2008 ford F-450 when it is in cleaning exhaust filter mode?

No, it is not advisable to shut down your 2008 Ford F-450 while it is in the cleaning exhaust filter mode. This process, known as a regeneration cycle, is essential for burning off soot in the diesel particulate filter (DPF) and shutting off the engine can lead to incomplete regeneration. This may cause issues such as reduced engine performance or potential damage to the exhaust system. It's best to let the regeneration cycle complete before turning off the engine.