Yes. Spec is 11 or more. Check for leaks in the main vac line, and if nothing else is leaking, suspect the vac pump, they do die. The plastic fitting in the center of the main line can crack, giving you low vac. You must order the entire line, you cannot get just the fitting.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!