I remove the rear engine cover to do this job. Reason being is the rear engine cover gasket is usually seeping or the bolts are not torqued to spec as they have no loctite on them and a low torque spec. I pull it, do the seal (without the proper tool, you can do it...just takes a little ingenuitiy), redo the rear cover gasket with rtv at the bottom inch and some loctite and to torque spec on the bolts.