Question about changing from PCEO to HDEO

[NickKehoe]

Hello,

I am trying out Rotella T 5w40 in my Jeep Wrangler 4.0 as I have read some good reviews about HDEO in the 4.0 engine. For most of the jeep's life, it has been using PYB 10w30. I have read that the HDEO will 'clean' out the motor more. Does anyone recommend me changing the oil filter early, or will it be fine throughout the OCI?

Thanks

 

[dnewton3]

Ok to run the filter for the whole OCI.

Honestly, I don't know that you'll get that much more cleaning with the HDEO, only because if you've been using PYB for a long time, it's already been well cleaned.

But using RTS certainly cannot hurt, other than a nearly-imperceptible loss of fuel economy from the thicker vis.

 

[NickKehoe]

thanks for the quick reply. Yeah I didn't know how much (if at all) it would help, but I wanted to try out 5w for the cold starts this winter and figured it wouldn't hurt

 

[Gator]

I have also been thinking about changine over to HDEO oil in my other 2 vehicles, is there anyone reason why it would be bad. I am taking synthetic vs synthetic, say Pennzoil plat or synpower vs Rotella T syn, Weights would be 5w30 vs 5w40 and my 2 gas vehicles is a honda 4 cyl with 150,000 miles and a 96 chevy v-8 vortec with 90,000 miles. My tohught is there is more additives, phos,zinc and cal vs regular oil and should be a longer drain interval or at least a higher quality oil at change time.

 

[mdocod]

Originally Posted By: NickKehoe
thanks for the quick reply. Yeah I didn't know how much (if at all) it would help, but I wanted to try out 5w for the cold starts this winter and figured it wouldn't hurt


Penz 10W30

Viscosity@40C: 69.7
Viscosity@100C: 10.53
Cold-Crank Viscosity (-25C): 6,170
Cold Pump viscosity (-30C): 15,400

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Rotella 5w40

Viscosity@40C: 95
Viscosity@100C: 15.5
Cold-Crank Viscosity (-30C): 6,400
Cold Pump viscosity (-35C): 28,000

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I don't think there is going to be much difference in cold starts between these 2 oils. (notice, the Rotella cold ratings are taken 5 degrees colder, but the viscosity is higher.)

If you are concerned about cold starts but want thicker operating temp viscosity, I would say go with GC.