I (US Mid-West) definitely pronounce this as having two syllables, with a schwa between the R and the L. In fact, I find it difficult to make a consonant cluster of RL. This is contradicted but dictionary entries that give the pronunciation as having one syllable.
How many syllables does the word have?
Best Answer
For many American English speakers, the distinction between /l/ and /əl/ is unclear when /l/ is in the coda of a syllable (it doesn't necessarily have to constitute the entire coda: see the related question about words like child, wild, and field) after a tense vowel, a diphthong, or a rhotic vowel. The exact set of vowels associated with this merger may vary between speakers; for example, I feel like I have a fairly robust distinction between /el/ (as in trail) and /eəl/ (as in betrayal) and /ol/ (as in stole) and /oəl/ (as in bestowal) although in fast speech I can imagine that I might merge them. (Normally, I pronounce /el/ as something like [eə̯ɫ] and [eəl] as something like [eɪ̯əɫ]). But I don't have a strong distinction between /oɪl/ and /oɪəl/: for me, it feels like oil basically rhymes with loyal.
This means that words that show this variation have an unclear number of syllables.
Wikipedia covers the possible environments in a section titled "Vile–vial merger" of the article "English-language vowel changes before historic /l/":