i have a 98 integra rs with 252,000 miles and its been leaking a bit out of this black cap in the center of this pic. anyone know what this is called so i can replace it? is it an easy fix? also you can see the caked on oil near the bottom of the motor behind the exhaust manifold. is there somewhere else the oil is coming from? i rinsed that whole area about 2 weeks ago and you can already see the build up again.

thanks