Been doing the oil changes on a family member's '01 RX300 with the V6 that is notorius for sludging up. When you take the oil fill cap off and stick your finger in there... you get nothing bug GRIT, and chunks of blk stuff on your finger. That can't be good. I just put mobil 1 in for the 2nd or 3rd time with a Pure1. Trying to de-sludge this thing safely. the Oil that came out had 5K on it and was Blacker than midnight. and that's M1 with a P1!!! they were previously taking it "lexus" to get Oil changes done.... they were using cheap cheap filters... some white quaker state filter I think. that's scary.... and not right. you should be getting TOYOTA/Lexus filters at the dealer!!!