Just changed my 2006 LS430 to Mobil1 full synthetic. Vacuumed out oil through dip stick tube and no hint of sludge. Now, I use this vacuum pump on my boat and Duramax diesel and it works wonders not having to remove the drain plug. I initially removed the drain plug on my Lexus after a pump-out and not a drop came out of the pan. The filter port was free of sludge as well. I have 88,000 miles on my LS.