How many mm over the top line on the dipstick?
Make sure you check the oil level at least 10minutes after engine shut down, van parked on level surface. Oil should be at operating temperature when you're checking it. If it were less than 10mm overfilled I would leave it as is. Otherwise it is easy job to just extract the oil through the dipstick tube with the vacuum oil extractor, many workshops would have them.
Remember top up only when the oil level is at the minimum mark on the dipstick, after toping up allow some time for oil to get onto the sump.
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