4 qts of oil is too much, you shouldn't put any more than 3 1/2 qts in the engine when doing a oil change.
But that isn't the problem, check the oil pressure sending unit and see if it is plugged in correctly.
Is it the oil light in the speed/tach bezel by the ignition switch or is it the engine light in the speedometer that is lit up??
The list of problems that will cause the oil light to stay on is
1-Improper circulation of the engine oil
2-low oil or diluted oil supply
3-problem with lamp wiring
4-faulty oil pressure sending unit
5-damaged oil pump
6-plugged oil filter element
7-incorrect oil viscosity
8-broken or weak spring in oil pressure relief valve
9-damage or incorrectly installed O-rings in engine
You may have got a bad oil filter try swapping out the oil filter and see what happens.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.