My uncle swore by seafoam in the crankcase and I found out the hard way

Poured a whole can into my 2002 F-150 before an oil change like he said and it blew a cloud of white smoke so thick my neighbor called the fire department, has anyone else had a mechanic give them junky advice that almost ruined their motor?

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leo_mason1h ago

Well now hold on, I've put seafoam in my old Chevy before every oil change for ten years and never had that happen. You might have had a different issue going on like maybe you already had some buildup that got loosened up all at once, or you poured it in too fast with the engine running. That smoke is normal for a few minutes, it just burns off the carbon deposits.