Glow Plug changing on Audi A6 2.5 TDI? - Big Dave
I have a '98 A6 with the 2.5 V6 TDI engine, with about 150,000 miles on the clock.

For some time, the engine has been difficult to start from cold, requiring several seconds of turning-over before it starts to catch. I have to continue to crank the engine for a further 1/2 second before enough cylinders are firing for the engine to run properly. There is often a brief cloud of whitish smoke after the engine fires. Once running, the car performs fine and it starts from warm perfectly.

All but 1 of the glow plugs are the original factory fitted items so I am considering getting all 6 renewed to try and improve starting.

However, my local (non-franchise) VW/Audi specialist is not particularly keen to replace the glow plugs on this engine as they have had several instances where they have snapped while trying to remove them, which then becomes a major job to drill out the plug.

Can anyone tell me
a) is it definitely worth changing all 6 glow plugs at this mileage as preventative maintenance? (i.e. is it likely to improve my starting problem)
b) does anyone know any 'tricks' as to how to get them out in one piece?

Glow Plug changing on Audi A6 2.5 TDI? - DL
I do know of glow plug 'snappages' on some engines but not had one go myself.....yet!

I'd give them a good soak with releasing fluid on a hot engine to aid removal. I reckon you'll be fine.

Given the V6 engine configuration, this could well be a tricky job...just set aside some time and don't rush the job, OK?

Let us know how you get on.
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