But using that philosophy, Toyota doesn't want to clean out the inlets on these V8's.
Also the catch can doesn't stop the soot. Only oil vapour. The soot alone causes more problems apparently.
I stand by original comment, Toyota have developed a modern hi-tech diesel V8 which must have cost a fortune to develop, but also expensive to produce. Do you think they would honestly leave out a £150 component just to create service revenue? If it was needed, I think they would install it.