Quote:
Originally Posted by jhein
That's what I was thinking. That if the lead was coming from a bad bearing there would be other abnormalities as well.
I don't really know anything about shear but can that depend on how the car it driven? For example if someone just puts around and the motor never sees any WOT vs someone who gives the motor WOT at least a couple times every time they drive? And if that's the case should I consider going to a 20w50?
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Unless the engine has trouble maintaining oil pressure toward the end of the oil change, or the UOA was indicating that a thicker oil would help on wear, there would be no reason to change to the thicker oil. Heat is the top cause for extra shear, harder driving equals more heat. More heat cycles from longer oil change intervals would be another area that cause extra shear. Some oils shear more than others. It isn’t a problem until the UAO comes back and says it was showing extra wear from your UOA trends.