0w-10 or 5w-10 -- any cars using this?

[wileyE]

Race engines that are running thin oils are usually clearanced for the thin oil, and the super thin oil has way more additive than our off the shelf API grade stuff.

The thinner is better arguement as presented (linked) by one of good forum memebers has one flaw IMHO. The engine that is lugged, or has enough power to pull a hill without a down shift, or has an automatic that aloows the engine to work at low rpm. In this situation, high load low rpm, the thin oil isn't cuttin the mustard.

 

[427Z06]

Quote:

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Race engines that are running thin oils are usually clearanced for the thin oil, and the super thin oil has way more additive than our off the shelf API grade stuff.

The thinner is better arguement as presented (linked) by one of good forum memebers has one flaw IMHO. The engine that is lugged, or has enough power to pull a hill without a down shift, or has an automatic that aloows the engine to work at low rpm. In this situation, high load low rpm, the thin oil isn't cuttin the mustard.

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Sure...any debate without including specifics like bearing dimensions, surface finishes, temperatures, etc, etc, is like urinating into the wind. As an aside, one also be might be surprised what is considered "low RPM" for hydrodynamic bearings.

 

[Shannow]

wrt 427Z06's comment. My turbine bearings (30 tonne load, 20" dia, 3000RPM on ISO32) only require jacking oil (which lifts the shaft) up to 400RPM. i.e. at 15% operting speed, the shaft and bearings are adequately separated by hydrodynamics.

Other station I work at has some of the smaller bearings on tilting pads, that need no jacking oil at 4RPM.