Blow by. This is a serious condition. Writes off blocks.
A number of reasons why it happens.
Older models still with the old copper seats (sheets) installed.
BDG brass based seats (sheets) installed. 80% chance of this problem at low kms. If you have these seats in your vehicle, get them out of there is my advise.
BDG injector seats removed from a KUN26 that had only done 18,000kms on them. Blow By in three cylinders.
People not installing the injector seats or injectors right. Pigs in the industry, and there is plenty of them out there.
Poor maintenance and not doing the valve clearance procedure properly.
Make sure the injector ports are clean before installing the new injector seats (sheets).
Make sure you only use Toyota genuine injector seats (sheets) which come with the new Denso injectors, for your vehicles.
The Roo.
Passing through country and seeing country are two different things.