internal engine cleaning

["doctor who" <ohwrd@xxxx>]

has anyone had there engine flushed out w/a machine that is deisigned to get 
the goop out of the engine.

I have a high mileage engine and based on the goop i have seen on the bottom 
of the oil filler cap have been considering having this internal engine 
cleaning done to my vehicle.

my cocern is I dont know anyone who has had there engine flushed like this 
and this service cost $200. I dont want to pay for this if it is not going 
to do anything. I was also considering switching over to sythetic type oil 
and i had heard a rumour that it is recommended that you have your engined 
flushed first before switching a engine over from stardanrd oil to 
synthetic.

does anyone have any experience w/this?

thanks in advance,
dr c.
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