The 4.2 liter 40 valve V8 engine was used in several Audi A6, S6, RS6, A8, and S8 models. The 40V V8 engine is driven by a timing belt system which links the cylinder heads, camshafts, and crankshaft to run in sync. This Audi A8 timing belt system consists of a wear resistant, high strength, corded/molded rubber timing belt (a.k.a. toothed belt).
A8 / S8 (D3 Platform) Discussion - OMG Timing belt broke on my 2004 A8, catastrofic damage-WTF - I'm so pissed I don't know where to start. Sure I have 110,000 miles and know I'm due for a new belt but it didn't happen in time. I searched the archives and didn't find any D3 cars with a broken belt. It started last
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audi a8 timing chain replacement interval