it is the crankshaft seal on the timing cover. I just paid $8.37 for the FELPRO timing cover kit. You get the shaft seal and three gaskets that you won't need if you just replace the seal. You take the bolt out of the harmonic balancer and use a steering wheel puller. Pop out the old seal with a screwdriver. Lightly polish the balancer seal surface with very fine sandpaper. Push the new seal in. One thing I found out the hard way is there is no lip that the seal presses against. First time I pushed the seal right into the engine.