2 Audi 4.2 V8 40v vs. 32v FSI. 2.1 Problems with the Audi 4.2 V8 engine. 2.2 Timing chain failure in a V8 engine. 2.2.1 There are a few telltale signs of a broken timing chain in a V8 engine. 2.2.2 Replacing the Timing Chain. 2.3 2. The accumulation of carbon in a 4.2-liter V8 engine. 2.3.1 Signs of Carbon Buildup.
How Reliable Is the 2015 Audi Q7? The 2015 Audi Q7 has a below-average predicted reliability rating of two out of five from J.D. Power and Associates. Read more about Q7 reliability » 2015 Audi Q7 Safety Score: 9.8/10. The National Highway Traffic Safety Administration gave the 2015 Q7 four out of five stars in the rollover test.2011 Audi Q7 TDI. THE BASICS Price, base/as tested (with destination): $50,900 / $71,800 Reliability 4.2; Write a review. Most recent consumer reviews. 5.0. Best car i ever drive.