Rotella T6 5W40 thinner than predecessor RotellaT?

[db500]

I was planning on running RotellaT 5W40 in my car due to the good reputation and I like the higher viscosity of 15.5 cst @100C. I wanted to reduce oil consumption on long OCI's. I just saw the new T6 version that has replaced it and the viscosity has changed. Now it is at 14.2 cst @ 100C.

Seems like a significant drop, even Mobil1 TDT is at 14.9, and 0W40 is 14. I always viewed Rotella T as a beefier and heavier oil. Anybody have any experience with the new T6?

 

[sangyup81]

I'm not ready to try it until the Summer but the T6 is supposed to be more shear stable. Would that help at all in your application?

 

[db500]

That would make sense...no benefit of having 15.5cst if it drops to 12 or 13 quickly. Thanks.

 

[mechtech2]

14.2 cst is still substantial.
The new formulation should be better.

 

[440Magnum]

Here's an extensive thread on RT6S:

https://bobistheoilguy.com/forums/posts/1725770/

Note Johnny's comments on page 2 and following, which I consider to be pretty authoritative.

RTS is superb oil- at least in gasoline engines that can tolerate a 40-weight. Its interesting that it, more than the other HDEOs, has such a loyal following among certain gasoline vehicle drivers like the turbo Subaru crowd and the Jeep 4.0 crowd, and the flat-tappet muscle car crowd. I think its partially the price point, but it sure turns in some darn fine UOAs too. I just posted another great one from my Jeep 4.0. I can't really think of another oil quite like it, the Shell XHVI base stock its built on is great stuff.