Because of the difficulty of moving crude bitumen through pipelines, non-upgraded bitumen is usually diluted with natural-gas condensate in a form called dilbit or with synthetic crude oil, called synbit.
bɪkˈʌz ʌvðə dˈɪfɪkˌʌlti ʌv mˈuːvɪŋ kɹˈuːd bɪtˈuːmɛn θɹuː pˈaɪplaɪnz, nˈɑːnʌpɡɹˈeɪdᵻd bɪtˈuːmɛn ɪz jˈuːʒuːəli daɪlˈuːɾᵻd wɪð nˈætʃɚɹəlɡˈæs kəndˈɛnseɪt ɪn ɐ fˈɔːɹm kˈɔːld dˈɪlbɪt ɔːɹ wɪð sɪnθˈɛɾɪk kɹˈuːd ˈɔɪl, kˈɔːld sˈɪnbɪt.