Flushing oils aren't any thicker than standartd oil. Indeed, they're usually a monograde, lower viscosity oil containing detergents, dispersants and antifoams. They're designed to get everywhere the engine oil can get, but more easily and with detergent effects. IF (in caps) a tappet is so contaminated that the normal oil can't circulate through the internal piston, a flushing oil MAY resolve it. Flushing oils are unlikely to make an oil seal leak unless it's already well worn and in need of replacement. If you want to know more, Google 'flushing oil'.
Personally, I fill the sump to at least the normal minimum point on the dipstick with a mix of flushing oil and a cheap diesel oil (also has good detergency/dispersion). I would't run for an hour with a half charge of oil. I don't flush at every oil change.
TC
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