oil light on/flickering!?

thanks for all the tough love guys..i cranked it up earlier and took it down the road a couple of times just a piece before i get in there and start messing around...the light did not come on at all this time...is it a possibility that it may just be a dummy light...regardless if it is or isnt i am going to get in there anyway and take all the advice im getting from yall but just want to know thats a possibility..and it is not a premium oil filter and the weight is 30 on the oil...with a 124,000 miles on the motor im thinking there is probably gunk built up that i need to clean out regardless...and yes vdart it is a slant 6. Thanks again guys.