@ c-bass, did you still have the vent plugs in ?? Or maybe your vent hose was plugged??
This is a better load tester https://www.amazon.ca/ATD-Tools-5489...324337&sr=8-25 Princess Auto sometimes has these on for $69!

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)