Royal purple XPR 10w40 question

[manolo]

+1 on Motul. I use it on motorcycles and my 986S. I've used just about everything they offer, from hand cleaner to tech grease to MoCool coolant. None of their products have ever let me down, but its definitely not the cheapest thing out there.

[jmatta]

This is not correct, wear occurs at startup with cold oil. Zero winter weight is supposed to be less viscous in colder temps, thus reducing friction.

Ten weight winter oil would by comparison have more viscosity which equals less flow, less flow equals more friction.

I'm not talking about cold start up wear...I'm more concerned about the thin oils ability to hold up under high temp conditions; i.e. shear. The base stock is just too thin and does not provide adequate protection under heat.

Run what ever you like...it's your engine.