When you are trading oil futures, if you hold a position over the monthly expiration date of the futures contract that price is based on, you will encounter a rollover. If you do not wish for your position to be rolled over, then you should close your position beforehand.

This is because oil is a futures contract that has a set expiration date. If you want to continue to hold your position over the expiration date, the old position must be closed as the contract expires, and a new one opened on the new futures contract.

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