Hi all... I have a question about the home maintenance kit I bought for my 2010 X500. In regards to oiling the pre-filter, the manual states, "NOTE: Do not put engine oil on precleaner. Engine oil on precleaner can result in poor engine performance.". In the kit itself though, there was a small piece of paper stating that the pre-filter should be oiled prior to installation. So which is correct? I always oiled the pre-filter on my GT235.