Rotella 10w30 syn blend in the 7.3

[JesseT7.3]

Its late I’ve been looking for the New Rotella 10w30 syn blend on here, trying to see if any one runs that in their 7.3. I need to change my oil here soon and just trying to figure out what weight to go with. I’ve tried Rotella 5w40 and it seemed to use a bit more than normal, maybe it was getting past the rings, I’m not sure. Right now I’m running Rotella 15w40. I did notice a drop in mpg from the 5w40 to the 15w40, about .50 to 1 mpg. Just trying to find a good year round oil.

[nismofan240]

depends on climate, when i lived in alaska i knew people who ran 15w40 all year round, i didnt do that i ran 5w40. with u in north carolina honestly just run 15w40 and you will be fine. just stick with a 40 weight.

[nismofan240]

p.s. i noticed a bit of oil consumption when i ran rotella synthetic, normal on diesels but then i switched to amsoil and havnt had hardly any consumtion. just hit 3k miles and havnt had to add a drop.

[JesseT7.3]

I was thinking about using Rotella 10w30 syn blend in the 7.3, I thought it might help my fuel mileage, there’s gota be some one who’s tried it. I know some people with the 6.0s like it, I just want to know if its safe to use in our 7.3s.

[nismofan240]

ill be honest, ive never noticed a mpg increase from switching oil but some people say they do but its going to be a very small gain if at all. the oil is not going to hurt the motor, but you need to think if you start with a 30 weight oil when it starts to shear down to the ballpark of a 20 weight, then i would be worried. most 40 weight guys dont like the thought of the oil shearing to a 30 weight. Only you can decide if you like it, run it for 3k miles then send a sample to blackstone labs and see what they have to say about it.