Pulling the EJ25 out of my 2000 Subaru Impreza 2.5 RS with 196,000 miles. I was a little behind on my maintenance and didn't change the timing belt in time. While the belt was just fine, the idler sprocket bearing pack gave out and this slacked the belt enough to damage the engine. It was cheaper to get another engine than to get the parts to rebuild the heads.

By the way, in the video I say that too much oxygen leans the combustion and my brother counters that too much oxygen makes it rich. I'm right, and he's wrong. Too much oxygen leans and too much fuel makes it rich.

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