I know some guys like to use Mobil 1 oil. On sale @ Walmart

[TeamAllen]

Walmart discounts select Mobil 1 Synthetic Motor Oil 5-Quart Jugs (in 7 varieties) for $22.47. Free Site-to-Store pickup, otherwise $2.97 Shipping + Tax.
Even with shipping, this is about 35% less than elsewhere.
Available in Mobil 1 High Mileage 10W-40 Full Synthetic, Mobil 1 5W-30, Mobil 1 0W-20 Advanced Fuel Economy Full Synthetic, Mobil 1 5W-20, and more.
http://www.walmart.com/search/search...ype=10&veh=aff