The sludge issue was more a problem on the non-Aero versions. In particular when not using synthetic and going for long change intervals. I do 4-5k intervals with M1, and last time I dropped the pan it was clean. That was on an 03. 04+ didn't have the sludge problem, or if they did, was much less of an issue.
The Soarer/Lexus SC are, imho, the best looking cars to come out of the 90s.
Wrong again, what it is is beautiful