Hi all. I've been changing my oil and filter every 1K. I use my largely stock DRZ (has 3x3 and jetting, but otherwise stock) about 70% road and 30% off-road. I wail on it routinely (within reason- i.e. not abusive, but I do ride it assertively/enthusiastically.) I'm about at my next 1K mark and am thinking of changing the oil (again w/ synthetic) but not the filter. Is it reasonable to do the filter "every other" change? This means 2K per filter, of course. My oil still looks new and my filters usually come out looking pretty good also. Thanks!