There never was a question about the wisdom of changing oil at 10,000 miles.
I think everyone accepts that.
OK, but I personally don't think you made that point very clear in your OP
There never was a question about the spec of the long life 3 oil being the "best".
Hmm - I'm not so sure. The fundamental point of your first post was that engines were failing, and the absolute cause was the LongLife oil. So to me, I take that kind of fundamental viewpoint from you as severly questioning the quality of the LongLife oils. I certainly didn't see any previous posts from you defending in any way the LongLife oils!

All I reported was that 2 VAG specialists who actually dismantle and rebuild engines,
and therefore see with mark 1 eyeball their condition,
have said that some of those that have used long life oil have been dirty and clogged,
those that haven't used it have been OK.
Now there could of course be lots of other reasons for each of these occurrences,
and we can all think of several,
and I don't believe that the cause-effect is in any way proven.
As I previously stated, I don't disagree that there has been previous issues with oil sludging. However, I do strongly dispute the very simplistic view which you seem to be relaying - in that two companies who strip down engines and find them "dirty" inside can then categorically and absolutely blame it firmly on LongLife oils.
This opens a massive can of worms.
Firstly, what make of LL oil was used, and what spec of LL oil was used. Secondly, were the requirements of the VW/Audi servicing schedules carried out to the letter, and were those cars on the LL regime actually used in full compliance with the LL regime requirements (ie, never going above 3,000rpm, doing more than 30miles in a single journey, not driving in a "sporty manner", etc).
Finally, the most crucial issue - do these two companies have more expertise than say Volkswagen, Fuchs, Castrol, Pentosin, Kluber, Bechem or the ACEA - and the vast masses of R&D and historical data they can all rely on - together with testing under strict laboratory "controled" conditions. I don't think so.
So, whilst these two "specialists" may have unearthed some undesirable traits, on what may be a miniscule quantity of VAG engines - then sure, some eyebrows should be raised, and even questions asked. But they should NOT be deemed as the authoritative "end-all" point of view. And as I have pointed out, some very serious questions need asking of these four VAG specialists, because it would seem that not even two of them can agree on the basic fundamentals of the specific concerns raised in this thread.
BUT, the first hand experiences of others who don't happen to frequent this site,
I thought, was at least worth knowing about.
It was my surprise at the initial comment from the first VAG specialist - see first post -
that prompted that post in the first place.
Sorry if all this challenges any deeply held beliefs.
No appology needed from anyone, and thanks for sharing. But I hope you see that even these so-called VAG specialists can be wrong too!
