engine fully assembled or apart ?

if it's a running engine ..
I don't recommend going 'too nutty' with cleaner additives at all.
Sometimes youcan push something that is tired over the edge ..
and turn it from something that was working, into  something that leaks
or whatever.

I do use hydrualic lifter cleaner additives sometimes.   Seafoam is a
great product , in general.

On 6/21/2013 7:47 AM, OlRivrRat wrote:
>        What is everyones favorite internal EngineCleanerUpperStuff ?
>
> Seafoam
>
> Rislone
>
> B-12 Chemtool
>
> Techron
>
> RedLine LS-1
>
>        or
>
> ??
>