I don't think anyone's going to want to mention the problems Toyota has had with oil turning to sludge. Although there's never been a recall, they've replaced a few engines...

http://www.cartalk.com/content/columns/Archive/2002/May/07.html

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'01 SLK320, '79 450SL & '01 C320 -- What? 3 Mercedes? I am DEFINITELY crazy!!!