so is that like iso 32 then?
the bigger names dont even show any specs of their oils at all, and the only number i got from robinair is like viscosity 110(iso 110?), but maybe the 'iso 100 compressor oil' will do fine also then, because i probably dont even have anything else around here?
or is the 'iso standard' taken at 40 degrees then, so the vpo oil is iso 32 and robinair is iso 27?
or maybe compressor oil has its own separate standard from a vacc pump oil and iso 32 for vacc pump is better than iso 100 compressor oil?
lol..
now some page says that iso32 oil viscosity index is like 107 and "iso72" viscosity index is 101, so maybe iso 68 would be best for these small ac pumps, because the supplied can had "100" written on it?
or colder climates would do better with iso32 oils anyway, because it flows better with colder temps than iso68?
well... some page now says that hydraulic (and compressor?) oil will contaminate the vacc pump forever and will even boil off at low pressures, so i guess im just gonna buy the special vacc pump oil that i also found, which is still iso 32...
yes, i guess the hydraulic pump oil will suit for compressors too then, but not for vacc pumps, because it has to meet some extra specs and is therefore more expensive too