Shell Rotella 15w-40 motor oil

[opfor2]

So what is the opinion on using Shell's Rotella 15w-40 diesel motor oil on out Tahoe's?

 

[blondie70]

I used it in a 4 cyl 2000 Jeep. No problems .

 

[buckwild27]

I use it in my 1929 Model A Ford. It's definitely not a winter oil for a tahoe

 

[donjetman]

T4? T5? or T6?

15w40 is not a good viscosity for winter.
If there ie a 5w40 or 0w40? this would be better viscosity for winter time.

 

[opfor2]

T4? T5? or T6?

15w40 is not a good viscosity for winter.
If there ie a 5w40 or 0w40? this would be better viscosity for winter time.

T5

 

[Foggy]

Oil pressure and viscosity run the DOD/AFM (if you still have it) AND
the VVT. Gen IV engines also call for synthetic oil that meets dexos requirements.
IF you are in a hot climate and for some reason feel you need a little "thicker" oil,
then you could do a 5w40 synthetic or even a 10w30 synth oil.
The only reason for going with a diesel oil disappeared about 10+ years ago
when used on flat tappet engines as they needed the zinc and phosphorus that
the diesel oils still had (but it's gone now). So no reason to use it in a gas
automotive application

 

[buckwild27]

I'm pretty sure Rotella 15w-40 still has zinc in it. But I definitely agree there's no need to run it in the Tahoe or any modern gas engine for that matter.

 

[ChevySSR]

my 2014 SSV maintenance records showed 15w40, when I was picking Tahoe up from the department, I asked to talk to the maintenance crew and they told me to keep on 15w40, they do that for all fleet cars after 90k miles. According to them this prevents many issues with oil consumption later on. I thought about going back to 5w30 in the winter, but for now am on 15w40.