I saw a post on another site a couple of years ago where a guy wanted to make sure he got ALL the oil out during the oil change, so drained it, then took it for a drive around the block with the plug out...... about a week later the motor wasnt running right so posted a question on why.....
And another....... guy detailed his car....liked the "new tire look" he got with the Armorall on the tires so did the treads too..... made them look brand new !!!! all nice and shiney...... he posted to find out why his car wasnt handling right anymore......
Don't forget the guy on the VW message board that heard about extrude honing; he assumed he was supposed to pass abrasive through the ports while the engine was running and sucked it in through the intake.
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.