Ford 5000 diesel. What oil?

[BillinAZ]

I have a 1968 5000 diesel. Would it be ok to use something like 15-40 Rotella in the engine, or should I stay with single weight oil. Mostly used in warm weather. Thanks for your opinions.
 

[Bern]

15-40 is just fine. All big-boy diesels (Cat, Cummins, etc.) run that as well.
 

[souNdguy]

15w40 c rated in most areas.. or 10w30 C rated in arctic areas.
 

[Larry NCKS]

[souNdguy]

I'm not a rotella user so have to ask?
is rotella a bad oil or something?
 

[Larry NCKS]

Evidence would suggest that Rotella is a sludge maker just like Pennsoil used to be (and maybe still is) in a gasoline engine.

The are better oils out there than Rotella!
 

[souNdguy]

i can remember way back when i may have used it a couple times.. but none in the last 10ys. it's not a comoonly sold oil here.

mobile delvac and delo and motorcraft and valvoline plus the store brands are what you see mostly here. mobile is probbaly the most common..
 

[flyingace]

[WGWKy2]

We use 15-40 in all our tractors except one that is going to feed or push snow then 10-30 but go back to 15-40 in the summer. The brand is the color of the jug, I don,t put the jug in the crankcase so it doesn't matter. 50 years no bearing or cam problums.
 

[Brian in MA]

I have been using Rotella exclusively in all my diesels for as long as I can remember. I know several contractors and truckers who have been running it for millions of miles too in on and off highway diesels. There is always something better, but I haven't seen the sludging problems that are reported. Rotella is a common product around here, it's in every farm, car and truck store, and until this post today I had never heard that it wasn't a good product.
 

[souNdguy]

that's why i asked.. I hadn't heard anything about it either.

in fact.. the last time I heard about a truly 'bad' oil was quaker state.. adn that was decades ago.

I run walmart or tractor supply oil in my tractors mainly. a couple get different oils ( motorcraft, and 1 is on syn, as are my trucks.. etc.. )
 

[Larry NCKS]

[Shoepeg]

Probably foolish to change the manufacturer of my oil, right? As far as I know rotella has been used in my 2000 Ford forever.
 

[Brian in MA]

After reading this thread I googled rotella trying to find some kind of research or expert analysis proving that there is a problem and I can't find anything. I won't stop using it until I see something concrete that makes me want to find a better oil.
 

[David G]

Rotella is fine, just pulled a diesel apart with 7000 hours on it, zero sludge, do not believe the wives tails.