Warm up the engine, then drain the oil and replace the oil filter. Detach the cable from the negative battery terminal. Raise the vehicle and support it securely on jackstands. Remove the bolts securing the oil pan to the engine block. Tap on the pan with a soft-face hammer to break the gasket seal, then detach the oil pan from the engine, avoiding prying between the block and oil pan mating surfaces. Use a gasket scraper to remove all traces of old gasket or sealant from the engine block and oil pan, and remove the seals from each end of the engine block or oil pan. Clean the mating surfaces with lacquer thinner or acetone, ensuring the threaded bolt holes in the block are clean. Clean the oil pan with solvent and dry it thoroughly, checking the gasket flanges for distortion, particularly around the bolt holes. If necessary, place the pan on a block of wood and use a hammer to flatten and restore the gasket surfaces. Install new seals in the retainers at the front and rear of the engine block, applying a 1/8-inch wide bead of RTV sealant to the oil pan gasket surfaces and continuing the bead across the end seals, ensuring the sealant is applied to the inside of the bolt holes. Carefully place the oil pan in position, then install the bolts and tighten them in 1/4-turn increments to the specified torque, starting with the bolts closest to the center of the pan and working out in a spiral pattern, avoiding overtightening to prevent leakage. Finally, add oil, run the engine, and check for oil leaks.