bsf31392

I just purchased a 2011 TDI prestige S Line and it idles loudly, at least to me. This is my first diesel and I am not sure if I am just used to the quieter gas engine. I thought I would ask here before I drove it in to the dealership.

Also, when I fill up my tank it says I have enough gas for 535 miles. Do you others actually see 600 when you fill up?

1a4nut

While I've only had mine for a month, it's certainly louder than even my v8 Volvo that it replaced. So it's louder than just about any gas engine I've known (from the outside), but my wife just pulled into the garage. Few minutes ago and I could hardly hear it in the house. But I always knew when the Volvo was home. So maybe it's the the frequency, or the vibration, but soon you won't really notice it.

aqaqaq123

Your Volvo was not a port injected engine, so it sounded smooth (so does mine). The current crop of direct injected gas engines are way noisier. My diesel sounds different but is just as loud at idle as my previous DI 3.6 (and louder than my volvo). Cruising on the freeway the diesel is actually quieter than the gas version, possibly because of the lower rpm. TDI engines up to 2012 are also louder and a bit rougher than the current generation.

Edd W

It's the difference between the controlled burning of fuel is a petrol engine and the controlled explosion in a compression ignition engine.
The Diesel combustion process is markedly different to gasoline in that on the current generation of multi-phase injection engines, a very small amount of diesel is injected to start each combustion process, followed by more pulses of fuel dependant of engine speed and throttle position as well as other factors. This dramatically reduces the noise from the combustion chamber because it creates a more gradual burn and allows the piston to start moving down the bore before more fuel is injected.
Diesels are usually quieter when warm as well which explains why you may not notice the noise as much after a drive.