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It’s a good idea to use the iDrive oil level check about once a month, since it seems to get flaky once the oil level is around 2 quarts low. I had an oil leak on the filter housing seal and lost two quarts in less than a day. I knew it was low, but could not get a reading from iDrive.
The iDrive oil level check function would just quit at about 80% of the check, until I put are least one quart in and got the oil up closer to normal.
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