If there is too much oil in the system it will affect cooling and you should
take your readings at about 1500 rpm and those pressure reading are relative to the out side temp. and if you don't have good air flow over the
condenser the pressure will be up. with the system running and your gages on take a garden hose and run water across the condenser and watch your pressure's drop high side and low side

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Keeping 'em Running
1990 300SEL
1994 E320
1989 E300