I just bought a Ford C-Max hybrid yesterday, so I'm thinking about either using Magnatec or Mazda Genuine 0w-20 in it. Will probably change the factory fill at 1k miles.
Any consensus on whether tons of moly in the oil helps the rings slip around & flex in their grooves and fills the microscopic machining marks in the cylinder bores and ring wear surfaces?
Honda and Subaru I think used to factory-fill with plenty of moly in there. Is there solid engineering theory at work, cuz some makes/models don't bother with it.
This kind of statement from bitog has me thinking ("mush"):
Originally Posted By: Jay
There are two ways an engine breaks-in. One is where the asperities collide and instantaneously weld and tear away. That, obviously, leaves more (but smaller) asperities and it generates a wear particle that can cause more wear.
The other way is by plastic deformation where the asperities are mushed down rather than torn away. Plastic deformation leaves no jagged edges and generates no wear particle. Moly is a highly polar AW/AF additive that greatly aids break in by plastic deformation.
And then Molakule is basically making a distinction between a break-in oil specifically, and a factory-fill, where a true break-in has no moly FM while factory fill might.
Originally Posted By: MolaKule
Quote:
My question is, if moly is so effective at plating metal and protecting it from wear, how to the metal surfaces mate and break-in? There must be something I am missing.
Moly is primarily a friction modifier, not an Anti-Wear additive.
If you followed some of the threads here, I stated that if an engine has already been run-in from the factory and uses a high moly oil, then that oil is a not a break-in oil.
A proper break-in oil has little or no friction modifiers but a lot of anti-wear additives.
Any consensus on whether tons of moly in the oil helps the rings slip around & flex in their grooves and fills the microscopic machining marks in the cylinder bores and ring wear surfaces?
Honda and Subaru I think used to factory-fill with plenty of moly in there. Is there solid engineering theory at work, cuz some makes/models don't bother with it.
This kind of statement from bitog has me thinking ("mush"):
Originally Posted By: Jay
There are two ways an engine breaks-in. One is where the asperities collide and instantaneously weld and tear away. That, obviously, leaves more (but smaller) asperities and it generates a wear particle that can cause more wear.
The other way is by plastic deformation where the asperities are mushed down rather than torn away. Plastic deformation leaves no jagged edges and generates no wear particle. Moly is a highly polar AW/AF additive that greatly aids break in by plastic deformation.
And then Molakule is basically making a distinction between a break-in oil specifically, and a factory-fill, where a true break-in has no moly FM while factory fill might.
Originally Posted By: MolaKule
Quote:
My question is, if moly is so effective at plating metal and protecting it from wear, how to the metal surfaces mate and break-in? There must be something I am missing.
Moly is primarily a friction modifier, not an Anti-Wear additive.
If you followed some of the threads here, I stated that if an engine has already been run-in from the factory and uses a high moly oil, then that oil is a not a break-in oil.
A proper break-in oil has little or no friction modifiers but a lot of anti-wear additives.
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