Setting for big rigs, 8 letters
Site of valuable deposits, 8 letters
Well-covered ground?, 8 letters
Where derricks rise, 8 letters
A region rich in petroleum deposits (especially one with producing oil wells), 8 letters
Old file is destroyed in valuable Arab lands (3,6), 9 letters
Engine-lubricant cleaning device (3,6), 9 letters
It may get changed in an auto garage, 9 letters
Thing that helps your motor cycle, 9 letters
One of many challenges for Red Adair, 7 letters