The oil could be dirty or the filter could be clogged. The oil pump screen could be clogged or the pump could be going bad.
bad oil pump and or main and rod bearings
oil filter housing
how do you change the oil pump on a 1991 s10 pickup
Locating on a 2000 s10 pickup truck: bronzer idea
I think it is on the accumulator/receiver dryer.
Hot at idle, 20-30 psi.
the coil
on the passenger side close to the firewall on the receiver dryer
The 1993 Chevrolet S 10 pickup truck air conditioning system holds 4.5 pounds of Freon. You can fill the system through the low pressure port.
That would be the low pressure service port and it should be located on the receiver/dryer.
antifreeze leaks by the intake gasket into oil. deteriating bearings causing oil to leak by the bearing
With a 4.3L engine, the oil pressure sending unit is in the back of the engine just to the drivers side of the distributor.