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We have been broke down in Pecos, Tx now for 5 days. 2008 F450,mini maxx tuner and dpf delete. We are having blow back towards the air intake. Unhook the dpf delte from the down pipe,start up the truck sucks well for about 30 seconds and then starts blowing back with oil. Previous to this had injectors 7 and 8 replaced. pull out of shop for test drive and then everything goes to hell. Really need some help, advice......
 

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mech 1
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without know anything else two things come to mind either the turbo seal on the intake side is leaking or the two cylinders you replace injectors in were damaged may be some ring damage should be able to pull glow plugs and tell if cylinder low compression or maybe oil coming out or both or pull oil cap while running and see if their is blow by but some times you will loose just the oil rings and still have good compression doesnt happen often but it does happen
 
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