Break in reman engine: Best Dino + Maybe Additive

[chucky2]

Apologies for not posting back in my own thread...I'm not sure the notify is working because I didn't get one that I can remember.

To be safe going to tell him to get some dino Valvoline straight 30 and the Redline at half dose or whatever. Thank you all for the replies and info!

 

[Zaedock]

While SAE30 will work I don't understand why you wouldn't use a multiweight.
BTW, the rebuilt Jeep 2.5L I fired up last night runs p!ssah.

 

[Shannow]

Idea of the straight 30 is more oil less other "stuff" while the asperities are getting ironed out.

An SAE30 will provide 15%(ish) more parts separation than a typical 5W-30 for example...and it's only for a half hour while you play running in the cam.

 

[Zaedock]

There is no load and oil temps remain pretty constant so IMO there is no benefit from running SAE30, but either way, she'll be fine.

Speaking of all things Jeep, we dropped a motor into a customers Saab a couple of weeks ago. While I was originally looking for a Volvo turbo for my AMC 2.5L rock crawler (tube buggy), it looks like I'll be using the turbo from the Saab. It's going to be a fun project.

 

[DWC28]

Originally Posted By: Shannow
An SAE30 will provide 15%(ish) more parts separation than a typical 5W-30 for example.


Do you have documentation for this? Sounds like it makes sense, but I have not seen this stated before,

 

[Garak]

Originally Posted By: Shannow
An SAE30 will provide 15%(ish) more parts separation than a typical 5W-30 for example...and it's only for a half hour while you play running in the cam.

How would that compare to a less typical type of 30 grade, such as GC, or an HDEO multigrade 30? Obviously, the ILSAC rated 5w-30s have an HTHS closer to the 3.0 area, whereas the other examples are 3.5 and up.

 

[Shannow]

Garak, spot on with regards to the HTHS what I was getting at.

The others would be an expensive 30 minute run, however, and probably have FMs in them.

 

[Garak]

You mean $10 a quart GC for a half hour run isn't a good idea?

 

[Shannow]

Originally Posted By: DWC28
Originally Posted By: Shannow
An SAE30 will provide 15%(ish) more parts separation than a typical 5W-30 for example.


Do you have documentation for this? Sounds like it makes sense, but I have not seen this stated before,


Head to figure 3 in here, and you can see MOFT (minimum oil film thickness) for a couple of viscosities

http://www.dtic.mil/dtic/tr/fulltext/u2/a321790.pdf

Quick math of the average piston speed/MOFT indicates an average shear rate of nearly 2M, which makes the viscosity in question definitely the HTHS type high shear viscosity.

Commentary pertinent to that section of the paper is that MOFT has to be greater than the height of the asperities (roughness) to stop frictional welding/wear, but this roughness is reduced during break-in.

I'd rather an high HTHS break-in oil, before going back to a GF-whatever...personally...IMO.