Originally Posted by
houston
Ive seen it a hundred times over smelly , rich lsn especially , that is 99% of the time the cause of front bearings seal being compromised and letting dirt get sucked back as pressures change in the crankcase
Agree and also another reason that suction may occur with a rich setting is as I mentioned before the oil being diluted preventing it from providing a proper seal in the oil groove thats machined in the block right behind the bearing.