Ok. That makes me feel better. I do wonder why only 5 quarts came out though. I couldn't get the oil filter off, whoever torqued it down put about 50ft lb of torque on it. I had to order a new oil filter wrench. Maybe the last 3 will come out when I pull the oil filter loose?

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2010 Mercedes E350 4Matic - 77k miles
1986.5 Nissan D21 V6 4x4 - 276k miles
1987 Mercedes 190D 2.5 Turbo - 3??k miles
1983 Mercedes 300SD turbo parts car
2017 Honda CBR500R - 15k miles
2016 Suzuki GSX S1000 - 9k miles

Something does not sound right. I don't know year you are talking about but I was thinking they did put dipstick back in them at some point. You should see the level at least above the "low" mark with engine cold. It will rise a little once up to temp but not more than 1/4" or so.

Drive it 20 miles, park on level surface with engine off, let settle for a few minutes. Level should be between marks. You will not get 3 more quarts out upon removal of filter.

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Jim

Some tips when taking the oil filter cap off ( or a spin on oil filter on other cars. ) Sometimes tapping the filter cap socket on helps to ensure full engagement.

Use a T handle, the will place pure torque on the cap rather than a partial torque and bending motion. This bending motion tends to jam threads making it more difficult to remove things.

If you don't have a T handle, user a medium length extension and hold the extension to counter the bending motion. ( If you are pulling the ratchet, push the extension. )

Apply steady torque not a jerking motion as the o ring needs to slide as the cap is rotated. Just let things slide along at their own pace.

The filter housing does have a drain valve that opens once the filter element is removed.

Look for a part number on the dip stick and confirm it is correct for the car.