This started when it got really cold out, single digits (Fahrenheit, USA), My car's oil light started to flicker on and off, and the engine had plenty of oil. I have been driving it at very low RPM, 1-3k RPMs max nothing higher, and very slow acceleration, I am giving the car plenty of time to warm up in the mornings before I drive it to work. The problem went away for a day or two, and then just returned this morning when I drove it to the gym after I accelerated fast to avoid an accident. The light will come on and go out as I go over bumps in the road, and it will show up when I am braking or accelerating, How common is it for a sending unit to fail on a P80 V70R? I don't hear any rattling coming from the engine, but to play it safe I am driving like a grandma with this car until I can get to the bottom of this. I am taking it into the shop to have them check the oil pressure tomorrow.