Oil is not countable. Uncountable nouns are normally only singular, and we cannot use a/an with them. (NOT a oil, you say a barrel of oil, NOT two oils)
it is
Transport is both countable and uncountable as a noun.
countable
Uncountable
uncountable
The gerund painting is a countable noun, as in "There are 12 paintings in this room."
Transport is both countable and uncountable as a noun.
countable
Uncountable
uncountable
uncountable
The gerund painting is a countable noun, as in "There are 12 paintings in this room."
Countable
countable
few is countable
The noun 'steel' is an uncountable (mass) noun, a word for a substance.
he asked me if the word fire wood countable or uncountable?
Countable