P0521 code Chevy V8

I had the P0521 code come up so I replaced the
sensor, code came back a couple days later and
replaced it again this time with a new screen down
underneath it and it still comes back on occasion
but am noticing that it's coming up not long after
start up on colder days (like around ~25F above
zero and colder). I haven't noticed any oil light or
anything. Good oil level and pressure and is pretty
clean yet. I replaced the sensor myself both times.
The car seems to run perfectly fine with no lifter
tick that seems beyond normal. If it matters any, I
am run Mobil 1 full synthetic 5w30 high mileage oil
along with a Mobil 1 oil filter since the car has
140k miles