my 91 190E 2.6 has a parastic battery draw. i measured the current draw at my battery and it was 1.8 milliamps which seems too high. what should it be in a car that doesnt have a battery drain problem?

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)