johnny

Epley's Maneuver helps get the stones where they belong,it may take a few times to get them to stay put but it works

changing oil off of fuel consumption, to me is the most logical way to go. If i recall correctly Caterpillar recommends changing at xxxxx revolutions of the engine but thet is a little tougher to measure. some tractors go off of lbs of fuel others use hrs of operation.