3k Royal Purple HPS 10w40, 07 Shelby GT500 63k mi

[donnyj08]

Have you considered Amsoil's 5w50 Signature series oil? Nice UOA BTW

 

[Horvath819]

I wasn't aware amsoil had a 5w50 oil. I will definitely look into that thanks man

 

[dave1251]

Fine UOA. I do not understand the brand jumping after only one OCI. But I am sure R.L. will work just fine after a clean and rinse OCI.

 

[donnyj08]

Originally Posted By: Horvath819
I wasn't aware amsoil had a 5w50 oil. I will definitely look into that thanks man


Yes sir! I believe it's fairly new, I just saw it in the latest catalog. Here is a link

http://www.amsoil.com/shop/by-product/mo.../?code=AMRQT-EA

 

[webfors]

Nice report! Strong flash! 15w, 20w or redline will help with the shearing.

 

[Horvath819]

Thanks guys, should be getting another uoa back soon with the same RP HPS 10w40 to compare to this one. Then I will be sending off the Redline 10w40 after I do my next oil change

 

[Horvath819]

Anyone ever heard anything about high lead levels using Redline oil?

 

[901Memphis]

The oil sheared a little but wear is still good, I wouldn't go any thicker than this since the engine doesn't seem to mind. You might even be able to use a 10w30 synthetic if you have a good oil pressure gauge. Maybe consider Mobil 1 0W40

 

[901Memphis]

Also Mobil 1 High Mileage 10w40 has a robust additive package and a 3.9 HTHSV.


Mobil 1 0W40 is 3.8 HTHSV.

 

[Horvath819]

I'm currently using Redline 10w40 and it has a 4.4 HTHSV

 

[A_Harman]

RP HPS 10w40 starts out at 13.6 cSt @100C, and this sample sheared down to 11.44 cSt. That's about 16%, and is well into being a 30-weight. I've seen other samples of RP that sheared a lot, but some that didn't. Since RP doesn't publish HTHS values, I don't use their motor oils.

I think the RL 10w40 will do better on shear. From my experience with RL, the Kinematic Viscosity actually increases with use.