I never disputed your claim Steve... 30w motor oil contains more suspended particles thus is thicker, thus clings better to itself, as it drys and evaporates... it does evaporate, what goes first is the actually lubricating media which are the hydrocarbons, the rest is just there to hold it in place. What you eventually left with is dirt attracted to the oil as I stated before. For a ram on a loader we are talking minimum lateral loads with a gap measurement between of 0.005-0.010 inch. As I said, better to have a fresh thin layer or lubricant than a visable thick one that is no longer holding it's lubricating properties, but only adding undue wear to the machine by holding dirt particles that act against the machine. The best practice is not to neglect that routine maintenance is part of upkeep. I don't rely on a visual cue of when to lubricate anything whether my car, motorcycle, or the ram on the loader and everthing else. Flush, change, whatever... then reapply on a regular basis. Clean oil of even the wrong type, will keep better maintenance than dirty or none at all.