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I have a 3.0 V6 Quattro rather than an S4 but my experience might nonetheless be relevant. I bought it at 6k as an ex demo. In my first ever post on this forum I remarked that the engine felt torquey but ragged at above 5k rpm. Somehow it didn't feel as though it wanted to be between 5k and...

Rotten egg smells are usually caused by catalytic converters.

When driving on the continent last week, I tested the top-speed of my A4 Avant 3.0. It maxed out at 145mph (prob had another 1-2 mph) before I got the willies and slowed down. This compares with the manufacturers spec of 151mph. Obviously max speed depends on various things such as wind...

Thanks - but why would it be green? Had a quick word with the dealer today who said it might be engine coolant. What's VSI oil? One more thing: on a 9 hour journey through France on the hottest day of the year last week, guess what: the aircon failed! It's stuck on ECON. When you press the...

I noticed that a mysterious oily green liquid is dripping onto my drive from the engine area of my A4. I thought at first it was windscreen wash but it was oily. Any ideas what it is?

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Is it possible to tune a 3.0 A4 - all the options seen so far are for turbos. Just out of curiosity...