I noticed in small print on the back of O'Reily's sale ad, in the motor oil and filter sale section, you can get a 5qt Jug of O'Reily's Full Synthetic Multi Grade Motor Oil and a Mobil 1 Oil filter for $21.99. Usually the Mobil 1 Filter is $10 alone. It doesn't say anything about a Mail In Rebate, so it's likely a No ******** deal. Limit is 2 sets of Oil and Filter.
I'm still stocked up from last time this was on sale. When I run this oil. Full Synthetic, and Mobil 1 or K&N filter, I don't change my oil until after 9000 miles but before 10,000 miles and it's still a dark gold when I drain it.
5qts Full Synthetic Motor Oil and Mobile 1 Filter $21.99 at O'Reily's