Carlos, yes, thermostat. Wix 1515 or NAPA 51515. Forget the R, it's wasted money for less filtration. This year I used 10W40 oil. You'll get lower startup pressures and cooler running. Believe it. 20W50 is not needed unless you live in Florida or the desert.
RE: wipers, I use mine and they have saved my bacon in downpours. Of course, I do have a top. But I have driven in the rain without the top, and they help there as well. In torrential rain, you will get some mist on the backside of the windshield, so I carry a towel in the door.