The ignorance in some of these posts claiming wax, sludge, etc would be laughable if it weren't so pathetic. Some are using the wax B.S. for a scapegoat for either poor maintenance or other factors beyond their comprehension or ability to research. Others are just indulging in stubbornness or self-righteousness which makes them appear even more uneducated. These kind of people will always be found and hinder progress with their ignorance and blinders. As far back as the earth is flat and the earth is the center of the universe all the way to 'I can make candles out of the wax in my engine from Pennzoil' and the like... Sad.