bob smeltzer commented on Paul Olesen's blog entry in Moto Mindkeeping your air filter clean is cheap insurance and a lot cheaper than a new engine for sure. the same for your engine oil. i like to use "NO TOIL" filter cleaner and oil. its biodegradable and used with warm water. I've been using it for years and it works great. I'm old school so i always put a thin coating of grease around the sealing flange, also by "NO TOIL" absolutely no problems weigh this method. hope someone can use this info.