Are one of the lifters bent,( on top centre) common on cylinders 3/4. usually caused by wrong oil?I have tested the wiring and contact resistance. Everything is ok. 0.4 to 0.5 ohm in all PDs Audi says 0.5-0.8 Ohm
Block 18 is all 0 0 0 0
The Camshaft seems at bit worn on cylinder 3 and there is sometimes a bit valve noise. Sounds like a leaking exhaust, only sometimes. The engine has a deep sound from cylinder 3-4 area hearable without the cylinderhead cover mounted and engine idleling.
All hydralic lifters seems easy to twist when camshaft is not pressing them down.
Should i replace the camshaft and lifters before driving the car?