Once I get the next 2 gallons I have on order from Amsoil it will give me 2 oil changes worth so am good for a while am also glad my DBL oil filters from my 5.9 will fit my new 6.7, I hated having to buy oil at $31.79 a gallon ( I did like the free shipping on orders over $49) when I use to buy T6 for $20. at Wally but now see 5w40 T6 online at Wally's for $145.99 when buying a 3 pack 


