Hello guys! I recently changed the ZKD on the 306 from my brother.(2.0l,8V,Xsi,Bj.94).Did everything work out and it’s close again without any problems. Shortly afterwards, the valve noises became noticeable.A short time ago, I heard it myself and it’s already enormous.But I didn’t finger anything at the valves. I first thought that this model had already installed hydros, but apparently not according to another forum (didn’t have it at all when disassembled). There I was also pointed out that it could be due to wrong oil, although I just tipped in the expensive Castrol. Now I just want to hear your opinion on what to do and where the cause for the crackling of today lies on tomorrow.Perhaps a simple oil change or should I completely adjust the valves. Gruss Michl