What model of Land Cruiser are we talking about? Generally the earlier series engines pre 1993 like heavier weight oils. I would switch to at least a 15w-40 heavy duty oil or perhaps for the summer a 20w-50 oil. Land Cruiser motors should not be using any oil at your mileage, so if the consumption is high it has been neglected. You might consider changing the PCV valve as this affects oil consumption in 2F, 3FE, and 1FZ-FE motors. Also the pan gaskets tend to leak so make sure you arn't loosing it there. With good care, Land Cruisers last for a long time. My 3 have an aggregate near 500k miles and all have original motors and use little oil. Bring the maintence on yours up to date and see what happens. 127,000 in a Land Cruiser is just the beginning.
Andrew
'76 FJ40
'84 FJ60
'97 FZJ80