Automotive engines are basically the same as Bike engines ?
Nope - whole different species !
In Automotive engines, all of the important bearings are "plain" or "Plane" which working with oil become Hydrodynamic bearings - that more or less "surf' on an oil film.
InThe Berg engine and most all dirt bikes, rolling elements are used as all of the important bearings, with Ball, roller and needle used for simplified oiling
The Hydrodynamic bearings are insensitive to dust size grit and surf right over it, as the oil film is thicker than dust
Rolling elements however mash the minimal oil film down to about nothing and roll right in to the grit, also water in the oil has strong actions at low-low quantitys
The
Bergeist seems to believe that by draining out our oil after each ride (or so) we extend the life of our two wheeled stallions.
I for one buy stupidly expensive Motul 300V 5w-40, and save what I drain, when I've enough - into the car it goes !
The oil filters available to us will catch the big stuff - the chunks, not the dust size grit, just down to 35 Microns.
Thats ok as we have a minimal sized oil pump - not intended to push oil though tiny tiny holes. SO we drain.
Here an article check-out figures 1 and 2
http://www.machinerylubrication.com/Read/23
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