Appreciate you taking the time to post this info, I wish I had learned this alot earlier, it would have saved me alot of worrying.
The diagnosis your giving for the leaky check valve sounds identical to what I'm hearing. Is this a DIY job that I can do in the middle of an oil change? Can you give me any tips on how to change the valve?
The first time I noticed the ticking I brought it to my mechanic. Timing chain was checked (no problem) and since the lifter noise is only heard on startup after the car has sat over a 1 week no noise was evident.
My car has 62K miles so I assume it doesn't need guides/rails or a chain yet.
02 C32 AMG
84 190E 2.3 5 Spd