Gunk in the Trunk

Those ancient ruins have survived ten thousand years of wind and weather, so I brought out my biggest and bestest bulldozer to flatten 'em. I call her "Margene." But my dozer's been letting me down lately, ‹name›. The moment I drove her into those haunted woods, her engine seized up with a spine-chilling howl. Now my engineers tell me something's clogging her valves. Go over there and inspect Margene's engine compartment, and bring me back a sample of whatever gunk has her stalled.