Answer: Alliteration: In towns too tiny for my big black
Car to quit...
Metaphor: They say, Sorry,
We don’t sell motor oil anymore with a grief so thick
You could touch it. Go on. Touch it.
It is early. It is late. They have washed their hands.
They have washed their hands for you.
Explanation: alliteration provides an alternative to formal rhyme - it creates a melodic and/or rhythmic touch to the poem. Here, the repetition of the t sound and the b sound give the poem a poetic feel as it were, contrasting the t of tiny with the b of big and black, adjective - noun, adjective - noun
The second quote is much more complex. The juxtaposition of oil and grief both linked by the adjective thick, which we often associate with oil here extended to the grief of the grocery store workers. The repetition of the word touch - touch the grief, touch the oil - which one are we touching? There is also a religious or at least spiritual metaphor here, with oil having a significant part to play in Christian religious rituals. There is no oil now and the grocery store workers have washed their hands, washed their hands for you, another religious metaphor. It shows that the grocery workers care but they also perform simple religious rituals. This is a kind of secular prayer, honouring the humble grocery store workers and the simplicity of their lives and of their beliefs, compared to the more complex issues that the poet is concerned with:
' I’d like us to rethink //What it is to be a nation'. and his PTSD with God. Perhaps the poet is/was a soldier who has had his faith challenged.