Oil Rating Calculator     for your conditions with this air cooler     select your oil flow   5 gpm 10 gpm15 gpm 20 gpm 25 gpm 30 gpm 35 gpm 40 gpm 45 gpm 50 gpm 55 gpm 60 gpm 65 gpm 70 gpm 75 gpm 80 gpm 85 gpm 90 gpm 95 gpm 100 gpm select  your thermostat temperature 180 degrees F200 degrees F220 degrees F240 degrees F260 degrees F your horsepower (HP) compressor discharge temp. (F)  helpful hint select your ambient temperature 80 degrees F90 degrees F100 degrees F110 degrees F120 degrees F input your suction pressure input  your discharge pressure select lube oil similar to yours SAE 10WSAE 5W-20 SAE 20-20W SAE 10W-30 SAE 30 SAE 40 SAE 50 SAE 20W-40 Summit PGS-100 150SSU@100F 215SSU@100F 315SSU@100F 420SSU@100F 685SSU@100F A515-100

Pressure Drop (psi) for different viscosities and thermostats

* Pressure drops are calculated with a 10 deg F rise above the thermostat temperature