I'm living in Malaysia where the temperature.

I'm living in Malaysia where the temperature here is high all year round. Alfas runs hot here with all the traffic jams. Therefore, I have re-route the engine breather hose where now it does not runs back into the air intake. I have run a hose out so that the hot air from the engine goes out under the engine bay. It cools down the running temperature of the engine. This was done years ago. However, since end of last month, I have been leaking oil through the breather hose. Lots of oil. It has never been like this before. Yes, oil do run up the breather but its quantity was insignificant. Now the leak is a lot. I need to top up the engine oil every few days. What can be the cause of this?

Nizam