Am I to blame? I added a whole bottle of ARX to my friend's 1.8t. She travels a lot and is n/a for car services most often. I had no idea that she had NO oil services since last spring when I added ARX. I found the same Fram filter on it and some really black oil. (PZ 5w-30???) Lucky, it was actually the 2nd filter, as I changed it after a month or two. Anyway, I sucked it out, changed the filter again from above (Fram!) and added a jug of watered-down used QS 5w-50 that was in my cousin's badly leaking low OP Rabitt. I took it out after it was watered down too far to keep the OP light off in favour of some fresh Syntec 5w-50 that did the trick. Anyway, that oil was a few weeks old, no problem. When the weather warms up, I'll continue to suck it dry and use my Delo 30 until it comes out clean. This car was already a victim of sludge, it got new OP and oil lines so I treat it like it still has sludge. I'm bad. Anyone interested in some slightly used ARX oil?