Originally Posted By: roadrunner1
Originally Posted By: neilLB7
Do yourself a favor and use ONLY the Motorcraft oil filter (with the correct OEM cap) and Motorcraft fuel filters (there are two). Get an 08 trans pan and 08 filter. And there is a small bypass trans filter on the lower right side of radiator. On oil, do not go much beyond 5000 mile intervals. And I recommend Rotella synthetic 5W-40. Otherwise Rotella semi syn 10W-30 (there is a conventional 10w-30 also). It's OUTSTANDING in the 6.0L. Cold or hot. My 6.0L ran like crud on DELO 400 dino 15w-40.....and I loved it in my former Dodges. You can't beat Rotella syn in the PSD 6.0L for the money.
6.0s shear the snot out of oil...and fast. And the HIGH pressure oil pump and unitized hydraulic fuel injection system will thank you for treating them right. It's important to remember that crankcase oil is also the injection system hydraulic oil. Totally different than anything else. And oil can affect how it runs in a BIG way.
And ONLY use Mercon SP in the trans. Available at OReilly by ordering. I wouldn't mess with LV like they say you can use now.
While I do agree with using only Motorcraft/Racor filters, I haven't seen the need of the larger transmission pan available on the '08 and up trucks. These trucks have more than adequate cooling circuits and transmission issues/failures are almost non-existent.
The only time(s) I have ever seen an 5,000mi. OCI needed was when I used the Shell T6 5w-40. I am not bashing the product, but it didn't hold up in my application. The results came back and I was shocked at the results, increased wear,and lower viscosity than what the 10w-30 was after 7,500mi. OCI.
The shearing of the oil really isn't that big of a deal in the 6.0, as long as it doesn't shear below the lower limit of 30wt. The 6.0 just seems to prefer a 30wt. vs. a 40wt., if you don't feed it 30wt. it will make it on its own, whereas the 10w-30 doesn't seem to shear much at all.
I will note that prior to me switching to 10w-30 I had three consectitive runs of 5w-40, and prior to that I run nothing but the John Deere Plus 50 15w-40 for years. My UOA results showed it to shear, but never out of grade like some of the results I have seen posted here. With my current '07 and my previous '04 I never experienced any oil related injector issues.
For whatever reason it just didn't hold up for me, where the 10w-30 is fine at 7,500 OCI and per UOA could be pushed out farther. I choose to stay within the owners manual recommendation of 7,500 mi., but I do UOA every OC to keep an eye on my engine.
At one OC I did catch an leaking o-ring with increased fuel in the oil, so the extra thirteen dollars every oil change are worth it to me.
Lube choice is important with the 6.0, but I have always went the manufacturers 7,500mi. OCI without issue.
I see so much talking up of the T-6 but every time I used it the conventional rotella outperformed it. It's a neutered version of an hdeo made to extend the life of emissions equipment. The t-5 semi-syn and the conventional are superior in the wear department but may not last as long in actual service.
I now buy rotella conventional by the 5 gallon pail. I use it in everything in the summertime. From my bikes to my equipment my roi with that oil is stellar. The t-6 at double the cost for basically the same oci just empties my wallet faster.
Just my experience,others may have great luck with it,or think they are.
