‎Should I use "an" or "a" or nothing in the following?

It's a product with (an) international quality

You shouldn't buy (an) oil with any of the following

People view (an) oil being refined as a selling point.

Canula oil is (a/an) RBD oil

Also can we say useful ingredients instead of healthy ingredients or does that convey different meaning?


For all the them, choice of a or an depends on the pronunciation, not the spelling. The last one

Canula oil is (a/an) RBD oil

You say "Canula oil is an RBD oil" if you pronounce it "ar bee dee". But perhaps someone pronounces it "rabid", then he would say "Canula oil is a RBD oil".

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