This excerpt taken from the PBR 20-F filed May 22, 2009.
PifCo depends on its ability to pass on its financing costs to us.
PifCo is principally engaged in the purchase of crude oil and oil products for sale to us, as described above. PifCo regularly incurs indebtedness related to such purchases and/or in obtaining financing from us or third-party creditors. All such indebtedness has the benefit of a guaranty, a standby purchase obligation or other support from us, and PifCo has historically passed on its financing costs to us by selling crude oil and oil products to us at a premium to compensate for its financing costs. If for any reason we are not permitted to continue these practices, this would have a materially adverse effect on PifCos business and on its ability to meet its debt obligations in the long term.