Originally Posted by West03

The worst thing you can do to a new engine is to let it idle like that during the break in process. The rod was put under enormous stress when the engine was run too cold. You must make sure you get the engine up to temperature as soon possible and maintain that temp. I would advice you do a search on heat cycling during the break-in process. When running a new engine in, more damage is done when the engine is below 80 degrees then if it was running at 130 degrees plus. After breaking in an engine, I would replace the original rod after no more then 3 litres.