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GM issued a bulletin a few yrs ago to dealers telling them to discourage owners from using engine flushes due to incompatibility with certain engine parts (meaning seals, I expect) and stating that failures associated with flushes would not be covered by warranty.
That plus the continuing failure of aftermarket snake oil pushers to provide unbiased, third-party laboratory evidence of the worth of their products tells us "don't bother".
Quality oil and filter, change as per owner's manual - that's all you really need.
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Bob (son's 81-244GL B21F/M46, dtr's 83-244DL B23F/M46, my 94-944 B230FD and 89 745 (LT-1 V8); hobbycar 77 MGB, and a few old motorcycles)
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