I made the mistake once of using an auto parts store oil filter and the filter housing gasket didn't fit right - I started the car up and I immediately got a small leak around the housing - I took the top off, put the old gasket back in and it was fine.

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Houston, Texas
1984 300CD 235K miles, Elvira, one owner
1987 300TD 180K miles
1974 TR6 78K miles Sarah Jane, one owner
OBK #27