I recently installed a vararam intake that I bought slightly used and it came with a Green brand air filter as well as the Green cleaning kit. It`s the same as a K&N only different color oil. It says not to use any other brand of oil as it will discolor the filter.I figure if I use a K&N cleaning kit it will just change the color from green to red. Are they just saying not to use other oil in order to sell more of theirs or is there actually a good reason for it. I don`t see the point of ordering the Green stuff over the internet when I can drive for 5 minutes and buy the K&N one at a store. Has anyone used this stuff? Is it just the same thing in a different color?