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For those that change their oil on their metal oil pan BMWs, the bolt torque is around 18 ft/lbs. That's running the bolt down until it stops and then just a gentle tug of the wrench (assuming 10 to 12 inch long wrench/socket) where the bolt might turn another 1/8"+.
In all my years of changing oil (about 30 years), I've never used a torque wrench, especially on a drain bolt where the torque spec is low. When you're dealing with sub 30 ft/lb specs, it's way too easy run past the torque spec before the wrench snaps because of the leverage as most torque wrenches are 18" to 24" in length. If you must torque your drain bolt with torque wrench, get a smaller torque wrench that does in/lbs. 18 ft/lbs is around 216 in/lbs. You'd be surprised by how little that feels.
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