Curious Norm, is your ML1002 made in US? I ask because if so in all probability it's a Puro Classic L14459 clone. If made outside the US, then a Mann Europe/Germany, different construction.
I never know what to think of enigne noise-filter anecdotes. So many variables that it's difficult for me to either give credit for lack of noise or blame when it happens. Guess if it works, ie., reduces/eliminates noise that's what matters. Just not sure of the actual mechanism/cause beyond a compromised adbv.
Hyundai/Kia do seem to have more than their share of noise anecdotes, especially spin on, using some aftermarket filters.