So I've had the head gasket replaced. Observed after a month, and there's still oil in my radiator.
I've been doing a lot of reading and I came accross an scenario that it could be from the transmission oil cooler.
The radiator diagram shows an oil cooler hose, in the manual from http://www.nicoclub.com/FSM/Sentra/1...ntra_GA/lc.pdf, and I saw a metal tube from the transmission connected to a rubber hose to the radiator.

Could that be the cause?
If it is, do I need to replace the radiator or just the hose?