You won’t ever get 8 because you only have 6 total. And the repair is not that simple.
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+1
… and, if the current problem is the result of a sludge-choked engine, there could well be other issues to come.
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Scary comment in this explanation… https://www.obd-codes.com/p3400
“The P3400 should be rectified as soon as possible and classified as severe”
The causes form P3400 are…
Low engine oil level or pressure
Defective valve timing control solenoid/s
Open or shorted cylinder deactivation circuit/s
Faulty PCM or PCM programming error