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[OmegaGav]

definitely take advice from mark 

just thinking out loud though isn't diesel knock more prominant on cold starts, mark? just wondering how bad the noise is for gav to be worried that theres a problem.

perhaps an uploaded vid???

good idea going to try to record noise at some point and post vid/audio 

[Webby the Bear]

definitely take advice from mark 

just thinking out loud though isn't diesel knock more prominant on cold starts, mark? just wondering how bad the noise is for gav to be worried that theres a problem.

perhaps an uploaded vid???

good idea going to try to record noise at some point and post vid/audio 

  will prob be easier for people to tell whether its normal or suspect 

[Marks DTM Calib]

Diesel knock would show mostly under load as that's when you have a few more revs and are putting more fuel on.

You need to find a good TRUSTED dealer and I am yet to find an Evan's Halshaw that fits that bill.

As for the diagnosis costs, they have stated that there is a fault therefore it should be fixed, my concern is that the skill level is such that they don't actually know the cause

[Lizzie_Zoom]

A few things could cause it.

I would be less prone to think diesel knock as it would be more evident when under load if it was.

The cold start setup means extra fuel is put in during the warm up phase which does make a diesel noisier, this would then quieten down.

Things to do are:

1) A good service using the CORRECT Gm oil and a fresh oil and fuel filter....this is key, the wrong or cheap oil can give such symptoms.

2) Clean the EGR up, a slight leak can cuase very little power loss but increased noise (never seen this on the 3.0 but have on the Mundeno engines)

3) Bash some diesel magic through it

4) Try some better fuel e.g. not bottom end supermarket stuff (such as Asda/Morrisons)

5) Run with a little 2 stroke oil added to the fuel to helplube the fuel system (about 1 part to 200)

Thanks for the advice Marks, must admit noise is when the engine is under load ie when accelerating through the gears and goes when she changes up and at low revs, noise not present on tickover.
She has a full vauxhall service history with Bellingers so would hope they have used GM fluids and parts !! And I have only used Shell diesel since buying her, as for working on her not sure this would be a good idea as it may invalidate the network Q warranty I bought with her
Got the report from their service department in the post (which suprised me !) and it states "injector noise but no concern at present"  So I think service department belive the injectors need changing but sales don't want to foot the bill !
Time to ask for a meeting with the director of Bellingers before complaining directly to Vauxhall 

Exactly my point!

Take the faulty car back to the garage and obtain your just legal rights.  Touch that car and you lose your rights.