This is very common on Honda's and Acura's
Check out BULLETIN # 01-009
Engine block does porous at the rear.
I would highly recommend you to put engine oil dye.You can go into any parts store a buy it. Its about 5.00 to 10.00 . Just pour it in ...
It will point all the leaks on the by the rear main area..
I seen the rear main seal,rear main cover and the casting leaking
I have done alot of these
Do you have honda care warranty???
do you get your car service at honda all the time
Why I ask is sometime the service mgr. can do good will warranty work...