Not to hi jack the oil filter thread but, what brand and grade of oil does everyone use. Also, how often do you change your oil. I change mine every 10 to 15 hours for regular ridng. If I have been riding in a lot of water, mud or sand I won't let it go past 10 hrs. I run Yamaha 20W40. I use two quarts per oil change and if I'm riding real hard I have to give er a little splash around 5-7 hours.