I run 15-40 Rotella all the time like I do in every diesel I have on the farm.
Cheezit told me that the regular oil would be fine in the 6.7 and I have not yet poured any synthetic in it at 43k on the clock.
May try some one day if I find a good buy.

 

Chevron/Delo is a premium product, many great UOA's on various applications over the years, the mineral based products are great too. Can't go wrong with any of them, unless you forget to service.....

 

I've read that the Delo 5w-40 Syn is far superior then the regular M1 TDT 5w-40 Syn...only place around me that sells the Delo Syn is Pep Boys @ $27.95 for a 4qt jug.

 

Ive run Delo 10w30synthethic blend. about 1k miles ago...only went 5k miles and changed it. Couldnt find the 5w40 full sythethic.

I needed the 5w40 so went back to Rotella T6. I wish everyone would switch to the 5qt containers like motorcraft.

currently at 125k

And just a tip! If you see a rebate on your Rotella products make sure they are still attached when you leave the store. I visited Oreily's and the clerk scanned the items and took the rebate stickers for himself. I ended up signing two copies of my receipt and didnt realize it as he was talking to me...Realized what had happend two days later when I changed my oil.


Now think how much a clerk can make in rebates just from keeping the stickers ....it adds up. Con-artist are out there guys!!

 

I get mine from Wally World

 

what the hell man that sucks .

 

Ive ran t6 in my 16 since the first oil change...i now have 9800 miles on it