I did the on-the-car IM cleaning a couple of days ago. LOTS of smoke, I hope that means it was doing some good !
My goal for the summer is to do the whole teardown cleaning, gasket replacement, etc.
I'm wondering if both methods have value. It seems like you should be able to do the teardown serious cleaning, and then do the on-the-car method every 10,000 or so miles (as someone suggested) to keep it clean? Kind of maintaining the cleanliness? Does that make sense?