[Pug]

Perhaps unnesecary, but you could change the oil on a 6monthly basis? I don't have an '8', but I change my oil twice a year (about 5000miles) because I can.

I would not recommend any oil additives or chemical flushes. The safest method would be to change the oil twice, within a day of eachother. Alternatively look into a company called EDT. We used to have a machine at work.

It uses a very thin oil, heated to temperature, which is then flushed around the engine with a machine through a filter which catches debris. The machine also pumps the oil above the standard fill level of the engine, which captures more debris. I did it once on my ancient Fiesta, and the oil now stays clean between services. It's pretty much still golden coloured now. Obviously, we have never done an '8' so I can't vouch for its performance, however every car we did responded well to it.

Those additives strip critical components of the very thin coating of oil which is left behind by the oil. I've never come across a horror story, but reading hard enough into it, it doesn't sound wise.

And as for oil brand, Quantum is what we used at work, when we had a large VAG franchise earlier this year. Sadly the brand is no longer associated with our company. But the previous comment as for production for VW is correct.

Good Luck Marcin!