Can someone look up oil spec?

[Team Infiniti]

 At the track and unable to do proper research I need a  Quick answer.

 

Shell Rotella T4  triple protection 15W-40  conventional  Oil, what is  it's safe operating temperature and break down/ failure  temperature ?

[takjak2]

I am not an expert, but the CJ-4 spec tests for shear at 150 C = 302F for which your oil is certified. 

 

Source: http://www.apicj-4.org/performance_specs.html

 

Anecdotal evidence from other good oil says 300F should be the upper limit used. Mobil1 5w-30 has acceptable shear/wear characteristics when run at 280F.

[JBgotM]

I was trying to find some good data on the CK-4 oils, and the Rotella T4 claims "50% better" than that.The breakdown isn't a switch, more of a time to degrade curve. I haven't been able to find any breakdown curves with temperature. Here is a decent little FAQ on the CK-4.

http://www.mmta.com/image_upload/New API CK 4 and FA 4.pdf

 

I would agree with takjak2 that 300F is a limit I would enforce. Even then, I would not want that for a 24 hour race. If I were running anywhere near 300F, I would change it every 7 hour race.

[Team Infiniti]

 We may see 260+ under race conditions, I have no baseline from previous engine on this, just trying to stay on the safe side.

 No worries on the degradation at that level over a 14 hour event but keep the info coming, I need knowledge to make a proper decision on race day if things go haywire 

Edited February 3, 2017 by Team Infiniti