Sardinian has several dialects, each with varying features. Phonologically, the Logudoresu dialect is most similar to classical Latin, actaully, from wikipedia:
The Latin short vowels [i] and [u] have preserved their original sound (in Italian and Spanish they became [e] and [o], respectively; in Portuguese and Catalan the [u] was also kept but written as an 'o'). For example: siccus > sicu 'dry' (Italian secco, Spanish seco).
Preservation of the plosive sounds [k] and [É¡] before front vowels [e] and [i] in many (though not all) words. For example: kentu 'hundred'; dÃ¨ke 'ten' or gheneru 'son in law' (Italian cento, diÃ¨ci, genero with [tÊƒ] and [dÊ’] ).
Absence of diphthongizations found in other Romance languages. For example: potest > podet 'he can' (Italian puÃ², Spanish puede); bonus > bÃ³nu 'good' (Italian buono, Spanish bueno).