i also think the problem with sludging on the old 1.8 20v t was also down to the small sump, for some reason this helped to create the 'sludging'
Don't forget that the vast majority of the 1.8 20vt sludging issues originated from accross the pond. The thick yanks refused to use 'expensive' fully synthetic oil - which is definately needed in a turbo. Instead, they thought they knew best by using shyte mineral oil, but chaning it every 2,000 miles. What then happened was the mineral rapidly carbonised in the very high temperatures of the turbo bearings - effictively trying to do in the engine - which takes nature millions of years - by turning oil into coal. Now in anyones book, solid particles in an oil are not good. And in a turbo, mineral oil can start being broken down in as little as 100 miles.
They did similar with the PD engines, and are repeating this with the GTI engine, with the FSI high pressure pump cam lobe wear. This is because they adamantly refuse to use 504.00 (and 507.00) spec oil (LongLife 3). How is this related to PD issues you might ask? Easy, the current LL3 is fully backwards compatible to all previous VW oil standards - so that would include the petrol engine specs of 502.00, 503.00 and 503.01 - and the diesel engine specs of 505.00, 505.01, 506.00 and 506.01. So any derv heads on this site will know that the LL3 is fully compliant with the diesel PD oils of 505.01 and 506.01. So you may still ask wtf a PD diesel has to do with the GTI engine - simple the ultra high loadings found on the PD camshafts are virtually identical to the FSI HPFP cam lobe loadings. Yet the yanks only use 502.00 oils, which have never had any PD-type of rating.
So, for us Brits and Europeans who generally stick to the manufacturers recommendations, and only use LL3 oil in their GTI - then I strongly doubt that they will experience any of the FSI cam lobe wear issues. Sadly, there does seem to be some Brits who like to follow what the Yanks say, and put 502.00 in their GTI, and I bet it is those who experience the FSI cam lobe wear probs.

Dinner time - SWMBO now nagging . . .
