Not taking a stand on this one way or another but in the course of other research I ran across this in a technical bulletin, perportedly from Champion Laboratories You may find it of interest. It says:
"Subject: Hyundai Engine Knock Date: May 2006 Number: STB01-06
Hyundai Technical Service Bulletin number 05-20-002, dated July 2005, indicates that some Hyundai vehicles might experience an engine knock noise, when an aftermarket oil filter is used. According to the Hyundai bulletin, due to differences in materials, construction and performance specifications, aftermarket oil filters can cause “pressure variations within the engine thus contributing to an engine knocking noise”. The implication is that only a genuine Hyundai oil filter will prevent the engine noise.
Champion Laboratories, Inc. has performed an in-depth construction analysis of the Hyundai original equipment oil filter number 26300-35502 and a battery of laboratory comparative performance tests in an effort to determine the basis for the Hyundai bulletin. Testing and examination found that the design and materials used in the construction of the Hyundai original equipment oil filter are not unique. In addition, a comparative analysis of the three critical performance areas, hot oil flow resistance, cold oil flow resistance and anti-drainback valve leakage, indicates that the Service Champ OF-4459 oil filter performs equal to or better than the Hyundai oil filter. Complete test results are available upon request.
Our conclusion is that the Service Champ OF-4459 will satisfy all Hyundai original equipment oil filter requirements for fit and function. There was no evidence found to suggest that the Service Champ oil filter would be responsible for an engine knocking noise, when used on Hyundai engines."
A PDF of this can be found Here:
Hyundai Knock