2008 Audi S4 Avant (6 spd) + 2014 Audi Q7 TDI. •. This is correct. When replacing the timing chains, you replace the plastic chain guides with the metal RS4 guides. The plastic guides are the point of failurealways. I just bought (yesterday) my brother’s (original owner) 2008 B7 S4 Avant (6spd) with 118,000km. Yeah, timing chain doesn't have a change interval. It's a car life time item ( aka warranty period). You change the timing chain when it's starts rattling. You can notice this noise on cold starts. Always when you replace the timing chain Buy the OEM raplacment set. ( Mercedes parts) It usually lasts 300-400k km on a B class. Hoping for some help. Car been for a service and technician an experienced guy, says the timing chain needs to be replaced as it is louder than it should be. not been changed since i owned it, a few years now. Timing belt has been done with original audi parts 2 years ago but no chain was done at the time. Bought it with 63k miles and it now has 89k. Man did my family have a blast. Constant state of Perm-a-grin was my driving experience for 3 awesome years, bragging to my audi weary friends about how this particular audi has a "no-maintenance" timing chain instead of a belt that costs 2k to change every 75 to 100k. And now A7 - Timing Chain on A7 - Afternoon Just been told I need a new timing chain on my A7 151 Audi have said this is going to cost €7,486.00 - 700hrs Labour Does this sound about right ? 2nd option needed ? Snow screen for air cleaner - Clean (Audi A4, S4, allroad, A5, A5 Cabriolet, S5, S5 Cabriolet, Audi Q5, SQ5, Q5 hybrid only) Ribbed V-belt and tensioner - Check condition and replace if necessary (Audi R8 Coupe, R8 Spyder only) Plenum Panel - Remove cover for plenum panel to check water drain and clean if necessary The 4.2 found in b6/b7 s4's uses a timing chain that has to be replaced at 100k. The older b5 2.8tt motor uses belts that have to be done rought every 50-60k if i'm not mistaken. Both motors have to be pulled to replace these parts. The timing belt, tensioners and rollers were all replaced. If the noise continues to get worse please let me know." On April 5th, roughly 48 hours after getting the car back, my wife took the car on an extended freeway drive for the first time since the timing belt replacement. Half-way to her destination, at 120,455 miles (59 miles after evL5C7.