Taking off the filter will not drain the oil, you will lose a couple of ounces at most. I do this about every 1500 miles to check for metal in the filter. Take off the filter, inspect and then replace. Takes longer to jack the car up than to check the filter.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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