I have used a K&N for years on the LR3 with zero problem. In fact, I have used K&N on all my cars for a couple of decades now wiht zero problem. What convinced me to use them was my wet/dry vac years ago. I had to replace the normal paper filter on my vac. It was almost new, but I ripped it. I bought a really good replacement cloth filter because that is all they had in stock. I was absolutely shocked at how much more powerful the vac was with the good quality cloth filter.
Likley not to the same degree with the LR3, as the filter that is used is of good quality. . .but it still seems to apply to some degree.
K&N is extremely easy to use, and use correctly. Pretty hard to mess it up. Maybe inexperienced guys show boating at the local power wash applying way to much oil, then driving immediatly. . . Can't see how it would happen if you follow the really simple three steps.