Timing chain OEM Audi or OEM BMW

My A6 has 158k on it, had to do the timing chains at 150k, the car is in immaculate shape otherwise and it was too nice to junk.

Oil is cheaper than a new timing chain.

My Audi A5 3.0tdi is chain driven and is on 185k and still going strong.

You have the N47 engine, which is known for premature failure and excessive wear of the timing chain. However, it's generally cars prior to 2011 that have this issue, with later iterations safer.

One of the reasons rs4’s hold their value is due to no timing failure.

I had my timing chains changed at audi dealership(A5, 2014, 2.0t) I had only 90000 miles, so it was preventative maintenance. After I changed the chains - sound of the engine changed - I started to hear something weird inside. Took it back and dealer said: it’s normal, maybe you have problem with belt or pulley.

Most cars with timing chains never need them replaced, its just badly designed timing chains like the BMW ones that do.