I recently came across this website loking for info for my 2001 Toyota Highlander. It has low miles, <36,000 and seems to have lost some power. Then I realize that the engine in the Highlander has a major design flaw that results in an unusual amount of sludge build up. So...tonight I check the oil fill and there was a ton on gritty oil, looked like the material you see on common ashpalt shingles. I have followed the manufacture's recommendations regarding oil service. My other car with more miles doesn't look anything like that; I can see the metal parts of the engine. I noticed on an old thread on Edmund's.com that Bobistheoilguy website previously had a link to information about this, but could not locate it tonight. Does anyone remember this? I will call the dealer tomorrow, b/c this looks like it needs serious professional help. Any recommendations?