I drive about 50 miles round trip each day (60MPH 2 lane country road) and yesterday it was fine until I got near my house on the way home. Again, I turned the car off and back on and the light went off. I drove the car to work today and the light didn't come back on yet. I just wasn't sure if I should try and change the oil and sending unit first to rule these two items out as issues?

The previous owner had the oil changed with Castrol synthetic blend at the Volvo dealership. It still has about 5k miles until it would be due but the date for the next oil change was listed back in May 2015. I am guessing he didn't drive it must before selling it / donating it.

I ready about sludge and o-rings in the oil pan but those seemed to be caused by the "no oil pressure" light coming on at idle. Mine only comes on while driving, not while I am at idle.

Any thoughts would be greatly appreciated. I was told the car was well maintained. I have included the history I was able to find online.

No check engine lights come on or anything of that nature.