Here are the results from my UOA. . The oil was in service over the winter since the other analysis listed on the page, about 10 months. I did do a bottle of Regane in the tank just before the UOA and this was also the first change after installing a Fumoto valve. What do you think about the high iron? I just changed to synthetic (QTorque) with a NAPA Gold filter. Change at the same interval and send another UOA or wait a few changes at about the same interval and resample?