Auto News Roundup 8-20-09: GM covers clunker cash for dealers, former CEO of Tesla drops lawsuit, Chrysler downgrades warranty

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-- GM to cover clunker cash for dealers until program winds down. Thetruthaboutcars.com

-- German officials seize documents at Porsche on suspicion of market manipulation. Bloomberg

-- Martin Eberhard, the former CEO of Tesla Motors, drops lawsuit against Tesla and current CEO Elon Musk. Leftlanenews.com

-- Chrysler drops lifetime warranty down to 5-year/100,000 miles for all 2010 model year vehicles. Leftlanenews.com

-- Smart ForTwo scores top rating in IIHS roof-strength test with best strength-to-weight ratio for small cars. Cars.com

-- Joni Gray