Amigos with 2.3L engines are equipped with a one-piece oil pan, while 2.6L engines have a two-piece oil pan. Begin by draining the engine oil, then raise the front of the vehicle and support it on jackstands placed under the frame, applying the parking brake and blocking the rear wheels to prevent rolling. If equipped, remove the splash shield. For two-wheel-drive models, disconnect the steering idler arm and Pitman arm, then drop the center link and steering damper. For 4WD models, support the vehicle on jackstands, remove the front wheel, and lower the front axle with a jack if necessary for oil pan clearance. Next, remove the flywheel dust cover and detach the oil pan by removing the bolts, taking care not to pry between the block and the oil pan to avoid damaging the sealing surface, which could lead to oil leaks; use a block of wood and a hammer to dislodge the pan if it is stuck. Remove all traces of old gasket material and sealant from the block and oil pan using a scraper, and clean the gasket sealing surfaces with lacquer thinner or acetone, ensuring the bolt holes in the block are clean. Check the oil pan flange for distortion, especially around the bolt holes, and if needed, place the pan on a block of wood and use a hammer to flatten and restore the gasket surface. For 2.3L engines, use a one-piece oil pan gasket, while 2.6L engines require ATV sealant; apply a thin coat of ATV sealant to the flange and corners of the engine block before attaching the new gasket to the pan, ensuring the bolt holes are aligned. Position the oil pan against the engine block, installing the two stiffener plates and the mounting bolts, nuts, and lockwashers for 2.3L engines, or just the mounting bolts for 2.6L models, tightening them to the specified torque in a criss-cross pattern. After waiting at least 30 minutes before filling the engine with oil, start the engine and check for leaks.