Engine blocks go through washers the size of your house at least four times before assembly.
Bores are honed in stages at a fraction of the pressure they did 'back in the day'.The honing process has been switched over to diamond tooling since the late '80s,the final stage of which is a 'diamond brush ' ,that cleans and removes all the swarf from the bores.
The low forces used in cross hatching the bores result in a 'roundness ' measured in millionths.Rings are very low in tension and do not remove any material from the bore ,they are seated from day one.
But go ahead and change the oil ,it is after all from the lowest bidder.
