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Year Make/Model Repair Frequencysuccessful repair trips per 100 cars per year Compared to all models for the same year  
2015 Audi A4 / S4   13 A4 / S4s, 5.3 months of data per A4 / S4, average 4300 miles

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2014 Audi A4 / S4 55 A4 / S4s, 8.6 months of data per A4 / S4, average 7800 miles10
0% 0% Fewest Trips Most Trips
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2013 Audi A4 / S4 106 A4 / S4s, 9.4 months of data per A4 / S4, average 18800 miles

Refreshed for this model year.
6
0% 0% Fewest Trips Most Trips
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2013 Infiniti G 34 Gs, 8.4 months of data per G, average 13400 miles8
0% 0% Fewest Trips Most Trips
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2012 Audi A4 32 A4s, 9.1 months of data per A4, average 36500 miles25
20% 20% Fewest Trips Most Trips
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2012 Audi S4 53 S4s, 9.6 months of data per S4, average 32100 miles57
70% 70% Fewest Trips Most Trips
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2012 Infiniti G 40 Gs, 9.3 months of data per G, average 26100 miles16
10% 10% Fewest Trips Most Trips
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2011 Audi S4 51 S4s, 10.4 months of data per S4, average 45400 miles

The repair frequency for the 2010 peaked at the same level a year ago, but has improved since. Could be an end-of-warranty blip.
43
40% 40% Fewest Trips Most Trips
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2011 Audi A4 43 A4s, 10.2 months of data per A4, average 46200 miles

The repair frequency for the 2010 peaked at the same level a year ago, but has improved since. Could be an end-of-warranty blip.
47
50% 50% Fewest Trips Most Trips
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2011 Infiniti G 68 Gs, 8.3 months of data per G, average 40600 miles11
0% 0% Fewest Trips Most Trips
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2010 Audi A4 37 A4s, 8.9 months of data per A4, average 55400 miles

Multiple reports of excessive oil consumption for the 2.0T engine. Some engines rebuilt with updated valves and piston rings.
29
10% 10% Fewest Trips Most Trips
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2010 Audi S4 57 S4s, 10.5 months of data per S4, average 54000 miles

Multiple reports of excessive oil consumption for the 2.0T engine. Some engines rebuilt with updated valves and piston rings.
50
40% 40% Fewest Trips Most Trips
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2010 Infiniti G 51 Gs, 9.4 months of data per G, average 55000 miles33
20% 20% Fewest Trips Most Trips
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2009 Audi A4 3.2 37 A4 3.2s, 9.4 months of data per A4 3.2, average 57200 miles

First model year of the B8 A4. Multiple reports of excessive oil consumption for the 2.0T engine. Some engines rebuilt with updated valves and piston rings.
41
20% 20% Fewest Trips Most Trips
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2009 Audi A4 2.0T 45 A4 2.0Ts, 9.8 months of data per A4 2.0T, average 60100 miles

First model year of the B8 A4. Multiple reports of excessive oil consumption for the 2.0T engine. Some engines rebuilt with updated valves and piston rings.
63
50% 50% Fewest Trips Most Trips
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2009 Infiniti G 63 Gs, 9.9 months of data per G, average 54900 miles17
0% 0% Fewest Trips Most Trips
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2008 Audi A4 42 A4s, 10.0 months of data per A4, average 74400 miles66
50% 50% Fewest Trips Most Trips
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2008 Audi S4 / RS4   10 S4 / RS4s, 11.2 months of data per S4 / RS4, average 58500 miles

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2008 Infiniti G 80 Gs, 9.7 months of data per G, average 71700 miles

Coupe redesigned for this model year.
22
0% 0% Fewest Trips Most Trips
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2007 Audi A4 48 A4s, 8.4 months of data per A4, average 84100 miles56
30% 30% Fewest Trips Most Trips
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2007 Audi S4 / RS4   19 S4 / RS4s, 10.4 months of data per S4 / RS4, average 66600 miles

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2007 Infiniti G coupe   11 G coupes, 9.0 months of data per G coupe, average 69300 miles

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2007 Infiniti G sedan 48 G sedans, 8.6 months of data per G sedan, average 87400 miles

Sedan redesigned for this model year.
40
20% 20% Fewest Trips Most Trips
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2006 Audi A4 69 A4s, 9.0 months of data per A4, average 102200 miles

Includes 2005.5. First model year of the B7 A4.
73
50% 50% Fewest Trips Most Trips
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2006 Audi S4   15 S4s, 9.1 months of data per S4, average 82600 miles

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2006 Infiniti G 56 Gs, 10.2 months of data per G, average 92200 miles48
20% 20% Fewest Trips Most Trips
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2005 Audi S4   20 S4s, 9.8 months of data per S4, average 82300 miles

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2005 Audi A4   15 A4s, 9.1 months of data per A4, average 104500 miles

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2005 Infiniti G 31 Gs, 9.1 months of data per G, average 97300 miles56
20% 20% Fewest Trips Most Trips
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2004 Audi S4   20 S4s, 8.9 months of data per S4, average 96300 miles

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2004 Audi A4 27 A4s, 8.6 months of data per A4, average 118500 miles124
90% 90% Fewest Trips Most Trips
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2004 Infiniti G 49 Gs, 8.6 months of data per G, average 101000 miles63
20% 20% Fewest Trips Most Trips
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2003 Audi A4 25 A4s, 8.8 months of data per A4, average 137100 miles

Which might explain why this stat is lower than those for the 2002 and 2004.
98
50% 50% Fewest Trips Most Trips
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2003 Infiniti G 45 Gs, 9.7 months of data per G, average 104800 miles72
20% 20% Fewest Trips Most Trips
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2002 Audi A4 29 A4s, 8.7 months of data per A4, average 150200 miles

First model year of the B6 A4, very high repair frequency. S4 still B5.
142
100% 100% Fewest Trips Most Trips
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2001 Audi A4 / S4   16 A4 / S4s, 8.4 months of data per A4 / S4, average 124700 miles

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2000 Audi A4 / S4   12 A4 / S4s, 8.3 months of data per A4 / S4, average 154800 miles

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Audi A4 / S4 / RS4 vs. Infiniti G Reliability Comparisons

You won't find Audi A4 / S4 / RS4 or Infiniti G reliability information like this anywhere else. Actual repair frequencies, not just vague dots, to make it clear how much the Audi A4 / S4 / RS4 and the Infiniti G truly differ in reliability.

These stats are promptly updated four times a year, to much more closely track Audi A4 / S4 / RS4 and Infiniti G reliability as the cars age. Others tell you how reliable the Audi A4 / S4 / RS4 and the Infiniti G were a year ago, when the cars were a year younger and had 12,000 fewer miles on them. Only TrueDelta tells you how reliable the Audi A4 / S4 / RS4 and the Infiniti G have been recently.

What People Are Saying about Reliability and the Audi A4 / S4 / RS4

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What Our Members Are Saying about the Reliability and Durability of the Audi A4 / S4 / RS4

Audi A4 / S4 / RS4 Reliability and Durability: Pros
YearBody/PowertrainComment
2010 4dr Wagon turbocharged 220hp 2.0L I4
8-speed shiftable automatic AWD
65,000 miles and not a single problem other than routine oil changes and tires. My BMW 335i is always in the shop and is a maintenance nightmare.
2006 4dr Sedan turbocharged 225hp 2.0L I4
6-speed manual AWD
Like that I can drive an Audi for 6+ years/100k+ miles and still feel safe.
2006 4dr Sedan turbocharged 225hp 2.0L I4
6-speed manual AWD
Dont walk; Run from any 4 cylinder Audi. There are many better alternatives. The engine block is solid; Everything attached to it is waiting to fail, usually with collateral damage. 5,000 USD has been spent over years 2013-2015 for service with a Audi/VW ASE INDI shop charging conservativly (due to the frequency I was forced to visit). Many interior trim pieces, while soft to the touch, are begining to seperate and fail. Sunroof rattles all the time. Power seats worked in some directions. Handy under storage seat bins were a nice addition. Timing belt service requies removal on the entire front clip, headlamps, crash bar, radiator, etc. The 2.0 also employs a timing chain on the rear of the engine driven by the exhaust camshaft (itself driven by the timing belt), which drives the intake camshaft and houses a variable valve timing unit. The chain and tensioner assy. are prone to failure after 110k and should be replaced along with the high pressure pump's cam follower. This 15-20$ follower is the achilees tendon of the entire cam-tower & pistons, I've seen the black protective coating worn away within 5k miles on my car. After the black surface coating is worn away, the cam lob begins shave the metal surface of the cam follower, dropping the metal shards into the oil flow. Fuel also mixes with the oil commonly at this pump due to seal failure inside the pump housing. Oil change intervals should not exceed 5k miles for this engine. Evap emissions system is effectively useless as the manufactorer has shipped/contiues to ship known sub-par components (leak-check pump & assy.), which causes intermittent MIL warnings and continued, pending OBD codes.Eventually, after 10-15k miles the vacuum's check control pump fails completely and requires replacement or a constant check engine lamp and lowered MPG's/hp. The faulty system will not pass an emissions inspection until replaced with a new, less broken unit from the dealer.
2006 4dr Sedan This car is bullet-proof. End of story. The B7 A4 is the evolution of B6/B7 platform and most of the kinks are ironed out in the final years. No worries here.
2006 4dr Sedan So far, perfect
2005 2dr Convertible so far so good, but I have only had the car less than a month, too soon to tell
2002 4dr Sedan turbocharged 170hp 1.8L I4
6-speed manual AWD
120k miles + and counting, no major issues
Audi A4 / S4 / RS4 Reliability and Durability: Cons
YearBody/PowertrainComment
2012 4dr Sedan supercharged 333hp 3.0L V6
7-speed automated manual AWD
Thermostat failed at 36,000 miles. Appears to be a common issue based on what I've read.
2010 4dr Sedan turbocharged 220hp 2.0L I4
8-speed shiftable automatic AWD
Very expensive to fix and not with the same history of reliability as Benz.
2007 4dr Sedan turbocharged 225hp 2.0L I4
6-speed manual AWD
My second A4 is better than the last, but I am glad I leased instead of buying. Reliability is just not world class.
2006 4dr Sedan turbocharged 225hp 2.0L I4
6-speed manual AWD
Not reliable, lots of dealer visits,
2006 4dr Sedan 340-horsepower 4.2L V8
6-speed manual AWD
Do not buy one of these used unless the timing chain pre-tensioners have been replaced. There are a lot of complaints of these breaking at 100,000 miles. Mine went at 99,100 miles and the dealer quoted me $10,000 to fix. I had to sell this car at a loss. What a waste!
2006 4dr Sedan turbocharged 225hp 2.0L I4
6-speed manual AWD
Expensive to maintain, constant repairs. 2500$ service bill (excluding oil changes) avg. per year to keep road-worthy.
2005 4dr Sedan In the shop 10 times during last seven months. Towed 4 times because not drivable
2005 4dr Sedan 340-horsepower 4.2L V8
6-speed manual AWD
The two cars I looked at were low mileage 2005s, CPO, and both had full service history, of which there was a lot. Both cars noted cooling issues and problems with the steering system repaired under warranty. Also numerous electrical problems.
2004 4dr Sedan Reputation for mechanical problems and expensive repairs
2003 4dr Wagon turbocharged 170hp 1.8L I4
6-speed manual AWD
The car is not reliable - sensors, electrics, etc.
 

What Our Members Are Saying about the Reliability and Durability of the Infiniti G

Infiniti G Reliability and Durability: Pros
YearBody/PowertrainComment
2010 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic RWD
Despite the high-performance, the G is rated above-average, same as our G35 - which has only been in for routine maintenance (and a couple of recalls). The old G35 only parts needing replacements in 7 years were the two clock bulbs.
2009 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic AWD
39 months with no repairs.
2009 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic RWD
Never had a problem in 25k miles of owning original G35, and reviews of G37 show similar results.
2008 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic RWD
So far, so good. Infiniti has a great reputation for long term reliability.
2008 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic AWD
Infiniti sedans have been reliable and a major reason I purchased it.
2008 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic AWD
I have now owned 4 Infinitis. THey are well made
2008 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic AWD
Reliability was listed as above average and have owned other Nissan products that were reliable.
2008 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic AWD
Replaced all 4 wheel bearings in one year :( Not sure what this would be from. Went to dealer to ask and they didn't have any TSB's on it. Not uncommon to have one go - but not all 4 in abou 5 mos. Suspect a local repair shop over torqued wheels - but no proof.
2008 2dr Coupe 330-horsepower 3.7L V6
6-speed manual RWD
very reliable
2007 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic AWD
Good reputation
Infiniti G Reliability and Durability: Cons
YearBody/PowertrainComment
2008 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic RWD
It has been in the shop for warranty work 2 times already.
2008 2dr Coupe 330-horsepower 3.7L V6
7-speed shiftable automatic RWD
Within my two year lease of my vehicle it has been brought it countless times for repair. Exhaust on the car was faulty and needed to be replaced twice. Apparently something was wrong with the resonators and it made a hideous metal pinging noise.
2008 4dr Sedan 328-horsepower 3.7L V6
7-speed shiftable automatic AWD
aforementioned wheel bearing issues.
2005 2dr Coupe 330-horsepower 3.7L V6
6-speed manual RWD
CU rated the G35 less than the Honda Accord in this area
2003 4dr Sedan 330-horsepower 3.7L V6
7-speed shiftable automatic RWD
Brakes, stereo, electrical system, seats, wipers etc have required more frequent repair than expected. In some cases you have no choice but to replace the defective component with a stock part which again fails after a similar length of time, kind of a vi