the weight of oil that is in the motor...10w-30 is more than enough, if the oil was changed and say 20w-50 oil was put in then your oil pressure is going to be higher...the oil is thicker or heavier
Engine oil pressure, cooling system pressure, ac pressure, fuel pressure?
Running fuel pressure at idle should be high 30s to lower 40s. Ideally 41-44.
High or Low Engine Oil Pressure Check related links below
check condenser
It could mean that the oil pressure is low or the temperature is high..It's telling you to look at the gauges on your dash.
If the compressor is not kicking in, check the fuse, check the compressor clutch air gap, check the low pressure cut out switch, check the high pressure cut out switch.
If you check the pressure on the low pressure line and it is very high then you should make sure the compressor is ON. You may have put the blower on, but on the dashboard there usually is a button that turns on the ac compressor. When the comp is on the pressure will drop into the "blue" range. This is the first check, and the simplest
Not sure what your asking yes you charge from the low pressure port it is the smaller one your hose should not fit on the high pressure side
High or Low Engine Oil Pressure Check related links below
You should generally sail with high pressure, as low pressure often brings storms.
The LOW pressure fitting is SMALLER than the HIGH pressure fitting.
The 400 tranny on a 1983 Chevy 6.2L K20 diesel have very high pressure.