The turbo does not kick in and the oil pressure is almost 0 but engine will start and run

I have a 2005 ford superduty with a 6.0 litre engine. It seems that my turbo isn't working and it has real low oil pressure.

Unless you use full synthetic heavy duty diesel engine oil, the turbo will fail--it's a universal truth. Conventional oil cannot take that kind of beating.

Check your oil pressure with a good mechanical gauge. If it is still low, journal clearances are likely too great due to wear.