I guess this is sort of on point with this thread? My elderly mother drives about 3,000 miles <i>per year</i>. I've been changing her oil and filter semi-annually. The car is garaged, if that makes any difference? With such few miles on any prospective oil sample, would it even be worth sampling? Would there be any wear numbers on which to make <i>any</i> worthwhile judgements, or would the "dilution-type" analysis numbers be the only numbers that might reveal anything?