not every one is lucky like you 
that will be a DIY , am sure some people can really do it.
the fellow member is highly worried and relying upon hearsay of mechanics.
Car Stalling at cold - what if the CVT is kaput and the transmission fluid is never changed since purchase?
engine ' Drinking oil ' what is odo meter reading ?
oil consumption of 500ml - 1 liter per 5000+ km for high milage engines in toyota is very common,. the member also missed to share any maintenance history since he own the vehicle.
blow back through oil dipstick could be result of clogged pcv valve
@dani_kk @babarhyd @rajaatta @Xulfiqar