Water loss at high speed

I'm losing water from my expansion tank at high speeds, although around town I'm losing some, but not all? There is nothing obvious - can you help?

BMW 320D Touring or A4 2.0 TDi Avant

I have been running a Passat 2.0 Tdi SE for 5 years, trouble free and doing 25k miles per year. I am now looking to replace it and am considering either a 12/18 month old 320D Touring or (from DriveTheDeal)...

Should I return my new car having found out that it's ex-rental?

I brought my nearly new June 2011 Audi A4 TDI Multitronic home last night, only to find on checking the logbook that the one previous owner had been Hertz. I had specifically said to the Audi dealer that...

Is there a known fault with the Volkswagen 2.0-litre turbodiesel engine?

I have heard that there is a known fault in the Volkswagen 2.0-litre turbodiesel engine, which I have in my 2008 Skoda Octavia, which causes it to cut out. Do you know about this and why there has not...

Why has my Audi A4's fuel tank contracted?

I have just had my Audi A4 serviced and the mechanic tells me that the diesel tank is curved inwards on the bottom underside as if it has been sucked in. Is this a common fault? What could have caused...

Turbo blown on a car bought two months ago - who covers costs?

I bought an 09 plate Audi A4 TDI two months ago from a non Audi garage but the turbo has blown already. The one thing that isn't covered by the warranty. Can I get my money back or the bill paid for...

Should I change the cam belts on my Audi A4?

I recently bought a Audi A4 S line TDI 2L 148bhp, reg in December 2008. It now has 80,000 miles. I'm having it serviced soon but wonder if I need to change any of the belts? Its last service was at 60,000...

Which comfortable car offers good performance in snow?

I had a new 2008 A5 3.0TDI Quattro. However I was very disappointed with the car's performance in the December 2010 snow, compared to my wife's 2002 Audi 1.8t Quattro. So I intend purchasing a new vehicle...

My Audi A4 is suffering a DPF fault - what is causing it?

I drive a three-year-old Audi A4 TDI and cover 85 miles each day to and from my place of work. My total annual mileage is roughly 28,000. On 5 November I drove my car from cold about a mile and went shopping....

How do I run in an Audi A4?

I am due to take delivery of a new A4 Auto 2.0 Petrol and wondering about running it in. I am due to drive to Ireland - mostly motorway and fast 'A' Roads. The owners manual says "no more than 2/3s maximum...