I took apart intake manifold and part with flaps both bank to clean them. on one bank there was oil leak so I will change seal. question: I noticed some space on the part that houses flaps on the outside. look at picture. I guess this part is made from two pieces. is it possible for oil to leak there? or are the two pieces molded together and I should disregard this. also I bought new rubber seal, but should I use some additional seal paste? Thank you in advance.