This is VERY bad and at the very least will result in a valve job, if not the destruction of the engine. This is why changing the timing belt is one area of maintenance that should never be skipped or stretched out. Always replace the belt according to the vehicle's maintenance schedule. Audi recommends changing your timing belt every 100,000
Timing chain: Audi S4 3.0 TFSI 260 kW / 349 hp / 354 PS | 2995 cc | 6 | VW EA839 | CWGD: Timing chain: Audi RS4 2.9 TFSI 331 kW / 444 hp / 450 PS | 2894 cc | 6 | VW EA839 | DECA: Timing chain: Audi RS4 2.9 TFSI 331 kW / 444 hp / 450 PS | 2894 cc | 6 | VW EA839: Timing chain: Audi RS4 2.9 TFSI 331 kW / 444 hp / 450 PS | 2894 cc | 6 | VW EA839Yeah, 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. Goes to show you the value of reducing oil change intervals, and doing an annual regardless of mileage driven, etc. Unfamiliar with the number of tensioners and chain slides/guides it takes to completely service the 3.0T motor in your car, but as you said, you did what you could with engine still in the car. what you should be asking about is if you should replace the timing chain GUIDES. they are made of plastic and often are the likely part to fail. you're at around the point to be kinda worrying, but not quite. i would say shoot for ~100k. but plenty of b6s have made it far beyond that. drive her nice, change the oil a lot and you should be fine. S4, and S5 only Timing Belt - Replace. Check condition of timing belt tension-ing system, dampening pulleys, and idler pulleys and replace if necessary. Every 175,000 kilometers TTS only Timing Belt - Replace. Check condition of timing belt system, damping pulleys and idler pul-leys. Replace if necessary. Every 205,000 kilometers A3 2.0L TDI only
Replace Every 90,000 kilometres A6 4-cylinder only Spark plugs - Replace Every 45,000 kilometres or 3 years, whichever occurs first RS 3, RS 5, TT RS Coupe S6, S7, A8 8-cylinder only Spark plugs - Replace Every 60,000 kilometres or 6 years, whichever occurs first S3, TTS, A4, S4, A4 allroad®, A5, S5, A6 4-cylinder, A6 6-cylinder, A7,
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