Walmart offers a selection of Pennzoil Platinum Full Synthetic 5-Quart Motor Oil Jugs, with prices starting from $22.68. Redeem this rebate to cut starting prices to $12.68. (This rebate is for up to $10 off.) Opt for in-store pickup to dodge the $5.99 shipping fee. Deal ends December 31.
Note: There is a limit of one rebate per person.
With these companies, it might be easier than you think to negotiate your monthly bill down.