inline engines esp 4cylinders the oil drains back very quickly, if engine is warm 5 mins is enough to get a reliable reading.
if a v-engine with VVT and complex oil routing / turbos it can take upto 30mins for even hot oil to get back to the sump..
Both physical factors from test / calibration of engine management oil level sensing systems on modern engines.
Sports cars with low sump pans even worse as height variance on dipstick equates to an larger volume of oil thats missing..
As for the original quote re oil light and braking / accel, sump baffle design is pretty well understood these days and your oil level would have to be super low to be missing the pickup..
if the flicker was due to tip out the light would be on at cold start when idling..
either your super low on oil or oil pump incapable of building pressure / pressure is being lost..or wrong oil type in engine..
most engines by the time the lamp is on youve already caused serious damage.
check oil level. top up.
if still flickers.
replace oil n filter.
if still flickers.
check elect connector on oil press sensor for open ciruit / poor contact / short to engine block (will be a simple switch unless modern engine with VVT).
if still flicker replace switch (VW's fail such that oil leaks through sensor body causing loss of oil and pressure fault but no engine damage)
all the above DIYable with Haynes manual and handtools (for anyone that fixes own bike).
If non of that has fixed it your looking at garage time, get them to check pressure in oil system, should be able to either remove oil press sensor and fit gauge or tap into a port on filter body, from that point your looking at time to take sump off replace pump if failling (unlikely), more likely would be high miles engine thats been poorly maintained and is loosing oil pressure due to wear and tear.
HTH..
