I believe the TSB actually warns of a knockig noise, but doesn't mention engine damage.

It actually happened to me with a Champ Labs made STP oil filter. The knocking was super loud. A factory oil filter cured it.


Quote:
Hyundai has released a TSB (#05-20-002) "Use of aftermarket engine oil filters causing engine knocking noise.” The TSB notes that, “Some vehicles may experience an engine knock noise with the use of aftermarket oil filters. Aftermarket oil filters may use different materials, construction and specifications than genuine Hyundai oil filters, which may lead to pressure variations within the engine, thus contributing to an engine knocking noise.