My oil pressure light flickers when I am breaking or idle?

I have a Chevrolet Lumina 97, I got an oil change at Valvoline Instant Oil Change yesterday at 5pm. At around 10pm, after the engine was warm I noticed that every time I held the break at a stop, the oil pressure light would start flickering. When I release the break, the light turns off. It still does this today...



What can the problem be??



Could this have been the fault of Valvoline seeing as how it did not happen at all until after the oil change??My oil pressure light flickers when I am breaking or idle?
check the wiring to your sender on the engine block it may have been disturbed or is loose during the oil change ~~My oil pressure light flickers when I am breaking or idle?
check oil level,and look under your car for leaks due to error in the oil change,drain plug,filter,and by the way it is true people who know use valvoline.My oil pressure light flickers when I am breaking or idle?
The used a low viscosity oil, a cheap oil filter or you engine is showing it's age or a combination of each.
check the oil level they might not have installed the oil filter properly and that can cause oil to leak out the filter.

professor layton