ok, i'm thinking about buying a 2001 avalon xls with 92k miles. Everything looks to be in good working order but i'm real worried about the sludge. after reading all the horror stories, i'm a bit hesitant now. is there any real quick way i can check to see if it's developing any sludge? the car is 7hrs away and i planned on going back to pick it up this weekend. i won't have time to have a mechanic look at it so what's the most i can do? also would like to mention that i own a 01 sienna w/ over a 140k on it. seems to run fine. am i just being paranoid from reading the stories?