here is a link to a forum where a man says the oil has not been changed on his car for 40 years.......yes 40 years.... and all he does is change the roll of toilet paper in his filter....

http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=36;t=000544

I burn the oil becasue i dont want to throw it away...