I regularly flush my engine every 3000 miles with KMX.
Has anyone every seriously thought that any of this flush stuff actually worked?
Get real.
A well maintained motor will only need oil changes for a long and healthy life. It does not need a cup full of a secret additive run it it for 5 minutes to clean out all the nasties. It just needs regular oil changes.
If your motor is old it needs a rebuild, it does not need a can of miracle cure to clean it out.
I have seen some good engines destroyed by a sudden change to diesel oils. The detergent oils need to be used from day one otherwise the oil filter will block up with the sudden rush of carbon from the detergent. If you block the filter it will bypass the filter and your good old engine is suddenly running on detergent oil full of carbon.
it will help all engines as it cleans out everything and the owner will feel the differnace in responce when they drive out of the work shop. I hate to think they will have to be on a flat bed a month later for a motor rebuild or replace it 
