Sounds normal. You don't really have to worry unless the pressere goes down to like 5 or 10 and does not come up to peg the guage when you reve the motor up. With 30 or 40 pounds in the situation you describe, no problem.

Good luck,

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Larry Bible
'84 Euro 240D, 516K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles