Temperature is too low…so worse for excess oil left…but it does not get over the problem of the excess sucking back into the fuselage. That’s all aerodynamic.
When you are going quickly the un ducted fuselage purges the fuselage of air out the back, when you slow down either slow pass and power up or at the top of a climb when the speed reduces and the turbine is sucking in huge amounts of air it sucks the smoke oil in from the back…