Audi A5 Forum & Audi S5 Forum banner

S5 3.0 TFIS V6 (B8.5) OK at higher mileage?

415 views 3 replies 3 participants last post by  SimonRoma  
#1 ·
Thinking to buy an S5 B8.5 and a lot of the good examples are, obviously given the age, higher mileage.

Just wondering if people who own them have any things to maybe keep in mind when buying this car, at let's say the 70-80,000 mile range? Aside from the normal things to look out for like the timing chain, does the car still hold up well when properly maintained? Is it worth the investment?

I understand I probably seem incredibly under-informed, have only owned Audis but never any at this performance-level. Thanks.
 
#2 ·
It's worth taking some time to read about this model. The TLDR is that the 2014 models (CREC engine in the UK) appear to have good reliability with most of the "known" issues fixed. If you need to buy an earlier model:
  • The engine timing chains loosen over time causing rattle mostly at cold start. The risk of not doing the expensive repair is that they jump the cogs and cause more expensive valve or piston damage. This area was redesigned for the new engine.
  • High oil consumption is normally due to PCV failure. Repair cost high because the supercharger needs to be removed. PCV was redesigned for the new engine however this may not have completely fixed the risk. (Warning, oil consumption can also be cause by piston ring wear. Don't accept any BS like "it's normal for this car").
  • S-tronic gearbox failure. This is the biggest risk and there are several failure modes, some of which can be repaired (e.g. mechatronics). The gearbox was revised twice, first in 2011 and again in 2013. No matter which version the car has, maintenance is essential (as minimum ATF & filter change every 38K). Unfortunately it seems that it is not uncommon for this to be missed!
  • Crank pulley failure. This is almost inevitable considering its construction. Fortunately not terrible to repair and gives a good excused for a stage 2 tune.
  • Carbon build-up, an unfortunately side-effect of the FSI system. Can be removed. New engine added port injection to meet EU6 and there is evidence this reduces the build-up.

So far the CREC engine seems to have introduced its own problem, although it's difficult to know how widespread it is. The supercharger has a magnetic clutch (again to meet EU6) and this can fail.
 
#3 ·
I see, I did not even realise the engine was updated again in 2014. I suppose the choice lies in what has been changed then, best to check if the work has been done to service/change the necessary parts rather than discriminate based on which engine? Thanks very much for the info mate, very helpful indeed.
 
#4 ·
Well done Dippy great summary! These cars are very strong BUT need loads of TLC and only VAG approved oil and fluids.