To replace the crankshaft front oil seal on 2005 and earlier models, first remove the 
Timing Belt and crankshaft sprocket, then slip off the sensor ring and the spacer behind it. For 3.8L and 2011 and later 3.5L models, remove the 
Crankshaft Pulley. Carefully pry the seal out using a screwdriver or seal removal tool, ensuring not to scratch the housing bore or damage the crankshaft, as this could lead to leaks with the new seal. Clean the bore in the engine and coat the outer edge of the new seal with engine oil or multi-purpose grease, applying the same lubricant to the seal lip. Use a seal driver or a socket slightly smaller than the seal's outside diameter to drive the new seal into place with a hammer, ensuring it is installed squarely and to the same depth as the original, checking afterward to confirm the spring is in place. The remainder of the installation follows the reverse order of removal, and after running the engine, check for oil leaks at the front seal. For camshaft oil seals on 2005 and earlier models, remove the timing belt and camshaft sprocket(s), detach the rear timing belt cover, and note the seal's seating depth before carefully prying it out with a screwdriver wrapped in tape to avoid damage. Clean the bore and coat the new seal's outer edge with engine oil or multi-purpose grease, applying grease to the seal lip as well. Drive the new seal into place using a seal driver or a socket, ensuring it is squarely installed to the same depth as the original. Reinstall the rear timing belt cover and tighten the bolts, then reinstall the camshaft sprocket(s) and timing belt, verifying that all timing marks are aligned to prevent major engine damage. Finally, run the engine and check for oil leaks at the camshaft seal.