The Delo 400 LE for sample dates 9/5/15 and 5/2/14 is the same oil. This is an extended OCI for 2 OLM cycles. I now have Rotella T6 in as I prefer the easier cranking of the 5w40 over the 15w40 during the late fall, winter, and early spring months where this truck get used the most, i.e. hunting...