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Injectors went bad after oil change?
We bought this used '04 6.0l. It has 75 k miles on it.
As in buying a used truck we started to service it.
it may have had a bad injector when we bought it, but couldn't tell for sure. It was pretty faint.
Now we changed engine oil to Mobil Delvac 15w40. We changed air, oil and fuel filters to Motorcraft from the ford dealer.
It had other brand filters in it before and not sure what oil.
We also filled the fuel tank and used the Ford Fuel additive.
Now we have 3 bad injectors, 1,3, & 7.
I have read where they may stick and is there anyway to unstick them?
Would an oil additive work like Lucas?
Am I way off base?
Maybe we did something when we washed off the engine?
Any help appreciated.