laserx: Please do let me know when your initial treatment is done.
300,000 klicks is a "fur piece" and you should be amazed what junk actually comes out. These engines are so well-designed and almost overbuilt: who knows just how far they can actually go with a little extra care? I intend to try and find out.
Getting the remnants of those various additives out will be very intertesting.
Have you had any major engine work done? What condition do you think your engine is now?
Regards!