what kind of oil are you guys using and how long between changes are you going

 

MOBIL 1 5-40 EVERY 5,000 MILES.

 

I have 5W-40 T-6 in it now for the winter, and will switch back to 15W-40 Premium Blue fo the summer. I have already some Delo 400 5W-40 syn for next winter, I also only use Ford filters and change my oil between 4000-5000 khm at the most.

 

Does Shell Rotella 15w40 meet the ford 6.4 specs ??
I haven't checked my manual yet as I've just purchased.
I've ran the Rotella in my 7.3 for 14 yrs with zero problems

 

I run the motorcraft blend. Does just fine. Always use the severe duty maintance schedule.

 

Does Shell Rotella 15w40 carry the CJ-4 rating ?

 

Yes, I don't know of any diesel oil made now that doesn't, if you find one without it has been on a shelf for a very long time.

 

The following are CJ-4 rated according to their website,
Shell Rotella® T6 Full Synthetic
Shell Rotella® T5 Synthetic Blend Technology
Shell Rotella® T Triple Protection
Shell Rotella® T3 Energized Protection™

Also the information will be printed on the label. Be sure to read the label before purchasing.

I use the Motorcraft Synthetic myself.