Double check your container. I'm pretty sure there is the API gasoline rating there somewhere. Unless they changed the containers. I think it was either SM or SL but can't be for certain since I've tossed the jug I had. I just drained that oil out today after a 7,700 mile run but will not be sending it in for analysis.
Rotella T5 10w30
- Thread starter vontis93
- Start date
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- May 28, 2014
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I ran RP HMX 5w30 last summer. As long as you keep the oil level where it's supposed to be,most engines outlive the rest of the lawnmower.
The container I have only has those diesel ratings on it
The CK-4 rated Rotella T5 does not have a gasoline rating on it anymore.
I going to use it to exercise my generators every month since I have it.
It’s what I run in my GCV 160. 
Rotella T5 10w30 will work perfectly in a GCV160.
It used to be that diesel oil had a ton of additives in it, a whole lot of detergents that could foul plugs and clog catalytic converters. But this isn't true any more.
So Rotella T5 10w30 won’t harm my 4.0 Sohc engine or catalytic converter?
If it's burning oil it may kill the cat quicker but you'll probably never even notice, I'm sure the API was mostly driven by the EPA because the purpose is to help extended the life of every single cat on the road and keep them running as efficiently as possible for as long as possible.
The new stuff no. I ran T5 in our old 2008 Hyundai sonata V6 after 100,000. It ran for about 150,000 miles on T5 until a leaky injector did in the engine while my wife's son was driving it.
Never got a P420 code on that car once, which means your catalytic converter is plugging up.
