Changed the oil in the '05 i bought recently after taking it out for a weekend and the filter was full of metal (aluminum) shavings. It didn't look like that when i bought it or the first time i changed the oil. Pretty disappointed since I didn't expect any problems, i've been treating it well and riding it pretty easy. Should i keep riding it? Am i going to need a new cylinder? Piston? whats the best way to approach it?