Hi,
I accidentally overcharged my 2000 Rodeo A/C (pressure gage shows over 45 psi). I tried to press on the low pressure valve to release some of the 134a refrigerant but I think mostly oil shoot out so I stop. How can I properly dirscharge some of the refrigerant to lower the pressure or some oil come out is normal on the low pressure side? Thanks in advance.

45 PSI at idle might be ok depending on the outside air temp.

65* 25-35 PSI
70* 35-40 PSI
75* 35-45 PSI
80* 40-50 PSI
85* 45-55 PSI
90* 45-55 PSI
95* 50-55 PSI
100* 50-55 PSI
105* 50-55 PSI
110* 50-55 PSI

It is normal to get some oil when you press in the schrader vavle on either high or low side (more so on high side). The oil travels with the refrigerant and lubes the compressor bearings that way.