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3/4 to 1 complete turn…don’t UNDER tighten the filter.
save the copper washer that goes between the plug and the pan. You can buy new ones ten at a time from BMW parts places. These are really meant to be used only once. They yield to the torque and are meant to deform by flattening. I’ve used the same one for years at a time, though…
I’d probably try to use a filter “socket” before piercing the filter with a screwdriver. They attach to a socket wrench in the same way as a socket will…and you will get more leverage than with a strap.
The use of 20W-50, or any weight for that matter, is highly dependent upon driving conditions, temperature, driving style…At this point, check your manual to see what it says. You might need a 10W-40, or a 15W-40, or a 15W-50….
If you know your car, you should just be confident that you added the correct amount. There is no need to start it for a minute and then let it drain so that you can check the level. You can easily check the level after the first complete start/run cycle after you go to the store or something. A master realizes that they added the 4.5 quarts, there is no way you would be so far off that you would harm the car. Bottles of oil have marks on the side that will let you know how much you added from partial gallons or quarts.
I suggest using the new oil to place a light sheen of oil on the rubber seal. The old oil adds dirt and contaminants. See the next step suggestion to avoid dirt or contaminants…. Also, not nearly so much oil should be put on the rubber. Only a coating, not any measurable amount. The amount of oil on that seal above is enough for 20 oil filters.