Amazon has a 5 qt. bottle of Pennzoil Platinum 0W-20 motor oil on sale for $22.97 with a $3.33 instant coupon for Prime members (free shipping with Prime). Pennzoil has a $2 per qt. rebate going until the end of the year. Amazon does charge sales tax. That means a 5 qt. jug of oil should be less than $12 after rebate. Sales tax will vary from state to state. The rebate form is available on the Amazon web page. This seems to be a good price to me. What do you think?