Chevron Corp. is seeking to appeal to Ecuador's highest court a ruling that it must pay up to $18 billion for oil pollution in the Amazon rain forest.
The U.S.-based company filed a petition with a regional court Friday seeking permission to ask the National Court of Justice to throw out the February 2011 ruling. The ruling was upheld earlier this month by a three-judge appeals panel.
The regional court has three days to rule on the petition.
Chevron says it will argue that lower courts allowed "extensive fraud and corruption" by lawyers for the plaintiffs.
Before last year's verdict, the case spent more than 17 years in U.S. and Ecuadorean courts. The contamination was caused by Texaco, which Chevron bought in 2001.