Audi S4 B6 B7 4.2L 40V BHF BBK Engine Rebuild Program. $10,999.95. Stage Option. Add to Cart. Share Tweet Pin it. The original and most trusted 4.2L 40V Chain Driven engine rebuild on the market. With nearly 100 successful rebuilds as of late 2023, we can confidently say we are a master at our craft! All of our rebuilds come with a final build Compared to the previous B6/B7 S4 which used a 4.2-litre V8 engine, the B8 S4 uses a smaller displacement 3.0-litre TFSI V6 engine, but now with the addition of forced induction via an Eaton mechanical supercharger. 3- Remove the Oil Seperater / PVC hoses - be careful not to damage these, very expensive to replace. 4- Detach various hoses - noting their location. 5- Disconnect all of the various wire harness connectors. 6- Not sure on this one, but you may have to unhook the intake manifold flap drive motor. An inline 4 just has a flat monotone, and it'll never sound as good as a V8, regardless of what exhaust is fitted. The V6 / VR6 is a bit better, but still no V8. When talking Audi V8's, many appear to have forgotten than the C5 RS6 4.2 V8 40V engine is boosted, by no less than 2 fat snails. An awesome engine, with a really wide, useful powerband. Save up to $4,458 on one of 14 used 2008 Audi S4 Convertibles near you. Choice Motor Car (Plainville RARE AUDI S4 4.2 V8 QUATTRO ** 6-SPEED MANUAL TRANSMISSION*CONVERTIBLE TOP** BRAND NEW To replace the air filter on an Audi S4, locate the air filter housing and remove the clips or screws that hold it in place. Remove the old air filter and replace it with a new one, making sure it is properly seated and sealed. It is recommended to replace the air filter every 30,000 miles or as needed for optimal engine performance. Audi A5 / S5 / RS5 Coupe & Cabrio (B8) - Audi S5 4.2, need to know common issues! - Thinking of buying 2008-2009 Audi S5 4.2 V8, not sure if manual or auto yet. Currently i got a 3.2 Audi A6, so i wonder if this engine is basically the same thing, except the extra 2 cylinders. What common problems/issues are there The Audi 4.2 V8 engine is an eight-cylinder powerplant introduced in Audi’s A6 and S4 models, initially in the 2003 and 2004 models, respectively. Although Audi has made some improvements over the years, it still experiences common mechanical issues, primarily if it hasn’t been maintained correctly or if there is a lack of regular servicing. At the time of testing there were no performance upgrades for the B6 S4 V8 engine. All cars used 93 octane fuel running fuel specific programs where available. Stock B5 S4 6-speed manual ; Chipped B5 S4 6-speed manual ; Stage II+ B5 S4 6-speed manual (chip, downpipes, full exhaust) Stock B6 S4 6-speed manual. The following data was collected 09 4.2 Oil Filter Cannister Leak. 4.2 V8 Discussion - 4.2 FSI Vacuum Diagram - I recently changed my brake pads and replaced one of the secondary air hoses on my 2008 a6 quattro with the 4.2 32V FSI engine (BVJ), and now I have misfires on all my cylinders and no other errors from VCDS other than mass airflow sensor readings being erratic which XGbnfJ.