"Prices are subject to change in accordance with oil-price fluctuations." Actually, the correct phrase at the end of a quote is: "Prices are subject to change without notice." You can however state a time limit for which the quoted prices will be valid. In your special case: "Prices are subject to change in accordance with oil-price fluctuations."

Also, it's spelled "sentence".

I would say: "Above rate is subject to the change in oil prices." or "We reserve the right to adjust the rate based upon oil prices." The first sounds more like a strict legal explanation if that's what you're aiming at. It really depends on what you are trying to say in the context of the situation.

I would say: "Above rate is subject to the change in oil prices." or "We reserve the right to adjust the rate based upon oil prices." The first sounds more like a strict legal explanation if that's what you're aiming at. It really depends on what you are trying to say in the context of the situation.

The second one is better, but neither are correct. "We reserve the right to adjust the oil rate." or "We reserve the right to adjust the price of oil."