itsbob said:
That's not EXACTLY what I was saying.. Automotive engines are now broke in at the factory DRY.. no oil. The machining is so exact, that if you put any oil in it, there is not enough friction or heat to break it in.. also why I understand they say to use dino oil during the break in on bikes. Synthetic dissipates heat too well..
Once again, never heard that before. if you use Synthetic oil for your break in period, yes, you are inhibiting the "seating" of the rings.
but breaking in a new car "dry"??? Hmm. Still seems ridiculous and havent heard that one before. how do they keep the rings from becoming welded to the cylinder walls that are mostly steel sleeves now in aluminum blocks?
Sorry, I just don't buy it. Engines are still machined using mechanical cutting tools. There are tolerances that get greater as the tools wear that can't be controlled. I just don't understand how closer tolerances or better maching practices or even "space age" materials could warrant a "dry" break-in. It's just not computing. Using a dry break-in negates all the "close tolerance" machining effort. It makes no sense And again, does NOTHING for the necessary heat cycles for the multitude of different metals used in engines now.