For those of you who use this stuff, Menards (the hardware/lumber yard store) has Quaker State Full Synthetic listed for $23.88 on a 6 quart sale. 10w30 or 5w30. They then have an $18.00 dollar rebate. The rebate is in the form of an in-store merchandise check instead of a genuine check, but I've used them before and there is no strings attached to it once you are in the store. In other words, it's like $18.00 cash once you use it in the store. Not affiliated with any of the companies, just thought I'd let you know......