Is an 'Italian tune up' effective in preventing or removing intake valve deposits (IVD's) on a GDI engine?
* My definition of an 'ITU' (on my manual transmission vehicle) is taking a fully warmed up engine up near the redline several times during the course of a long drive .
* My definition of an 'ITU' (on my manual transmission vehicle) is taking a fully warmed up engine up near the redline several times during the course of a long drive .