Lubrifier belong to the 1st group.
Lubrifier is conjugated the same way that verbs that end in : -ier
Lubrifier is conjugated with auxiliary avoir.
Lubrifier verb is
direct transitive. Lubrifier verb is a direct transitive verb, so passive voice can be used.
However, although the terminations are perfectly regular, stem can be irregular and have numerous variations.
Lubrifier is conjugated the same way that verbs that end in : -ier.
LUBRIFIER : v. tr. T. didactique. Rendre glissant une partie de l'organisme. La mucosité des intestins sert à les lubrifier. Par analogie, Lubrifier les rouages d'une machine.