I contacted my friend for the answers to your concerns. What he told me is that if your engine has been treated like ass - hotrodding, not changing oil, general failing to take care of it, then yes, cleaning your shit can cause problems. However, it is important to note that an engine flush does not CAUSE problems - rather it reveals them. If your engine is relying on carbon and/or gunk buildup to run, you shouldn't be hotrodding it, you should be fixing it.
He said that if you do this once and encounter no problems, then do it for every oil change, you should never have problems.
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