Cut open my used Knecht (a Mahle company) filter. It is constructed extremely well. The can is thick enough that it can't be crushed by hand (unlike some cheaper brands). It features a heavy base, metal filter seam, metal backed ADBV, many large holes in the core for plenty of flow, and a bypass valve that has been factory sealed with a black rubber plug to make it a full-flow filter (the oil bypass valve is part of the Audi/VW 1.8L turbo engine). This filter costs around $8, but you get what you pay for.
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