The OIL contract prices are generated from the NYMEX exchange with an additional spread.
The OIL is traded on monthly sessions and the first two digits of the symbol specify the active month and the last two digits specify the active year, e.g. OIL0908 ≡ OIL September 2008.
The OIL contract positions must be closed by the end of the expiration date of each contract. Any account carrying any OIL instrument that is to be expired, will require to close their open positions on the last trading day at least half an hour before the market closes. Otherwise, Windsor has the right to close any open positions remaining in the account (without prior notice). This process will start taking effect from half an hour before the market closes, until it closes on the required instrument.