Yes it was fixed then (sorry about my wording) - what I meant to say was the prob started about 60 miles after the oil change (where they put 1 qt more oil). Roughly 60 miles after draining the prob went away - this is what I was trying to say.
Then this week my car was without battery for a day. With the new battery, the Oil Pressure warning light started flickering rapidly (very solid this time).
I assumed that it got reset with the batt out - while driving for about 4 miles, flickering stopped and became had faint red light. Then it seemed to have faded too.
The car battery was removed for a day - I understand that this reset electrical memory. Since the new batt connected, the original issues have returned except the check engine light is brighter than before.
Like the last time, will it take about 50 miles before the check engine light disappear?
@Barkydog - do you have any reason to believe that this is due to low rpm? I rarely take this car to freeway - typically 2-8 miles at no more than 40mph.