Quote:
Originally Posted by manyboats
When the VI improvers are less effective the oil will thin out. But if dino oil is the same viscosity when warmed up ....... no reduction in friction or temperature will result. But w extreme multi-vis VI improvers are probably employed and if they "wear out" or fail in any way an overall reduction in viscosity will result and lower viscosity will result in less heat and lower friction. But that will happen w dino oil in the same way. But lower viscosity will result in a lesser ability for the oil (dino or syn) to keep the metal parts from contacting each other. But w the syn oil running longer change intervals more time will tend to break down the viscosity improvers and it's possible or even likely that the viscosity of syn oil could or would suffer from extended change intervals.
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No offense intended, Eric
, but I'm totally confused!