Originally Posted by jeff78
A...
I'd guess that thickening is more common with non shared sump big Twins because these engines tend to be air cooled (correct me if I'm wrong) and thus run hotter. The greater heat causes more oxidation, and not having a transmission means little or no shear to knock the viscosity down some.
Its got nothing to do with the engine or the heat which many UOAs with other oils that I post (and others) prove.
It has to do with Mobil 1 and Amsoil, whatever the issues are (or are not) with their motorcycle specific oils no one has been able to explain. Except maybe they are designed for shared sump bikes in order to maintain shift quality, if they were no name oils everyone would trash them in these forums for thickening up but since they have a name brand ... well ... I and everyone else does not know.
Its clear no other oils behave this way.
A...
I'd guess that thickening is more common with non shared sump big Twins because these engines tend to be air cooled (correct me if I'm wrong) and thus run hotter. The greater heat causes more oxidation, and not having a transmission means little or no shear to knock the viscosity down some.
Its got nothing to do with the engine or the heat which many UOAs with other oils that I post (and others) prove.
It has to do with Mobil 1 and Amsoil, whatever the issues are (or are not) with their motorcycle specific oils no one has been able to explain. Except maybe they are designed for shared sump bikes in order to maintain shift quality, if they were no name oils everyone would trash them in these forums for thickening up but since they have a name brand ... well ... I and everyone else does not know.
Its clear no other oils behave this way.
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