Though I run Amsoil in the main truck (sig), the beater gets Mobil 1 Extended performance 5w30 in the winter, and 10w30 in the summer because I run synthetic in everything. With 5w30 in the winter, consumption is about 1/2 a quart between 3000 mile changes, and 10w30 yields the same in summer. I was just wondering if anyone has used M1 0w-40 in their trucks year round with good results. It has worked magic with my friends' ***** fleet, and Ive done some reading about its use with LT1 f body and b body cars. The point of this is that I might be able to purchase in bulk for a good price, and just want to hear from whomever has tried it. Lets keep this oil thread in check and on topic gentlemen.