Engine Flush, cooling system flush

[BrianPal10@domain.elided]

Today I took my Alfa in for an oil change.  They asked me if I wanted a 
"upgraded" oil change, which included running the engine with some treatment 
before filling it with new oil.  Since I had never heard of this, I opted 
against it.  Just wondering if any of you knew what it was about.  Is it 
beneficial and/or safe for Alfas?

Sort of on the same topic, I do my cooling systems flushes myself.  I heard 
once that cooling system flush detergent can be harmful to the engine, so I 
just flush with distilled water, run the engine, then refill with 50/50 mix.  
Is this the best method?

Thanks,
Brian
'82 Spider

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