True Stevie, but if you start listing every potential diesel issue you’d never buy one.
This will be my last diesel. Have come from Audi 80 1.9 TDI, wife had A2 1.4 TDI, then A4 2.5 TDI Quattro, then Allroad 2.0TDI and my current Allroad 3.0 TDI. Throw in a couple of daily drivers including a Skoda Fabia 1.4 TDI and Polo 1.4 TDI.
What are the advantages? Better fuel economy, low end torque, engine longevity? All my previous Audis were at 150k plus, except my B8 Allroad which was just 65k miles and treated like a princess. My daily commute before Covid was 50 miles.
Euro 6 technology pushed diesel technology to the limits. Yes you can have lower emissions, but VAG engineers left potential ticking time bomb with EGR valves and AdBlue tanks.
What’s the option? Petrol? Forums are littered with excessive oil consumption threads or disintegrating rocker arm needle bearings. Electric, well funny you should mention that, wife now has BMW i3 REx, so hybrid. Cracking little car, but it has its quirks.
You have a couple of options and this has stood me well. Service it within an inch of its life. On 2.0TDI, then 8-10k oil changes miles. Fuel filter ever 20k miles. Run a can of Forte diesel conditioner through it under 1/4 tank and drive it like you stole it. Always get to temperature and use on journeys of up to 1 hour minimum 2-3 days a week. Use premium diesel every few tanks.
If you’re spanner handy, get VCDS. I changed my attitude about mechanics when I was a nipper (circa late 90s) and discovered a ratchet still attached to the underside of my mum’s Vauxhall Astra 1.8 CD (incidentally not a diesel). Returned it to the service desk with a curt “I believe this is yours!”