I am curious if anyone here has used the PF12 machine from BG on one of their engines?

http://www.bgprod.com/products/engineoil.html

sample quote

The BG PF12 Power Flush & Prime for Engine Oil Systems injects a safe, effective cleaner into the oil system. The engine is run for 15–30 minutes during the procedure. Sludge and deposits which are the result of thermal breakdown of the engine oil by the high temperatures of heavy stop-and-go driving, are removed from the cleaning solution as it is pumped through the BG PF12 filtration system. This ensures that there will be no plugging of the engine oil system. As the piston rings are cleaned, engine compression improves, which increases power and improves fuel economy.
When the cleaning process is completed, the cleaning solution and any residual oil are air-blown from the engine. Then engine oil and BG MOA®, a superb lubricant and highly effective deposit control conditioner, are injected back into these air-blown areas to ensure instant lubrication at start-up. A new oil filter and the balance of the engine’s capacity of oil are then installed.
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some of the Toyota shops have a similar flushing machine (aka MotorVac)

http://www.motorvacsalesandservice.com/2373/12001.html