Motul 300V 5w-40 vs. Motul 300V 10w40?

[alpha6164]

Is there a reason to chose the 10w-40 formulation over the 5w-40 formulation? It seems a bit confusing cause the 5w-40 has an HT/HS of 4.51 and the 10w-40 has an HT/HS of 4.19. Usually its the other way around.

This is for a high HP turbocharged application. I just didnt know what the 10w-40 offers that the 5w-40 does not?

I called Motuls tech support and they could not explain why the 5w had the higher HT/HS.

 

[boxcartommie22]

i mix 1 qt of 300v chrono 10w40 in my redline 10w30

 

[Leo]

I thought the 5W40 was the biodegradable verison of the 300V. The 5W40 has shown some nice UOAs so I'd be going with that!

 

[dirty]

i thought all Motul oils were biodegradable?

 

[yannis]

Right off the bottle numbers often don't mean much in real world applications.
The 10W40 is more robust and it will hold its viscosity longer.