Mobil is doing an oil sale through the end of the year. $7 off per gallon of mobil delvac 15w40 or $10 off per gallon of 5w40 turbo diesel synthetic. The catch is it is only at certain retailers(pretty much the big parts chain stores), but rural king is one of them and has 15w40 delvac for $12.99 a gallon and 5w40 synthetic for $21.99 which is about the same as walmart, and they're one of the listed retailers.
https://www.mobil.com/en/mobil-delvac/products/promotions/60-off-diesel-domain
https://www.mobil.com/en/mobil-delvac/products/promotions/60-off-diesel-domain
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