the specs for the leakdwon test are:

max of 25%
max of 10% at the headgasket and valves
max of 20% at the pistons and rings

should be done at operating temp

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