Hello everyone, I would like some advice on a good oil to use in my kompressor, currently use the Shell Helix Ultra 5W40 is said to be an excellent oil, but I would like to move on to something less viscous type 0W30, risk of doing damage with this viscosity? The use of my car is mostly over short distances of about 15-25 km, normal driving with light foot between 1500 and 2500 rpm, some pulled up to 5000 rpm, operating temperatures from 0 ° to 40 ° Winter Summer I live in the south of Italy. I took a look at several good oils: Amsoil Signature 0W30, 0W30 Redline, Mobil 1 AFE 0W30, Pennzoil 5w30 ... I'm really confused, I accept the advice of any kind.