Why use something that does a half assed job at best when you can use something that works. GM Top End Cleaner for combustion chamber cleaning(2oz in each cylinder for 4 hours and use a dif pump to remove excess before starting), Forte Injector and Valve Cleaner and then for the crankcase I've never used anything but the GM 6&8 cly oil stabilizer*Will fight lifter noise as well* I would never do an "engine flush" as offered by so many either. If you have deposits you want to get rid of, one to two oil changes with Castrol Edge Full Syn will clean it right up with 0 chance of damage to any seals.
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A SS looks like it could kick your ass if it wanted to, but a WS6 looks like it's coming over to do it
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