When I purchased my beaver I received information at time of purchase that for some reason the engine was replaced by the previous owner(s) with a Cat re-manufactured C-12 engine. Documents obtained from Cat at the time of my purchase indicate the reman date was 4/19/04. obviously the installation date was sometime after that but there are no records of when that happened. My silverleaf (VMS II) now indicates that mileage is approx. 38,000 miles. The odometer now reads aprrox. 115,000 miles. Question #1- Is it safe to assume that the engine was replaced at approx 77,000 miles? Question #2 - I have been told by silverleaf and others that the silverleaf would have been zeroed when the engine was replaced. Does that sound reasonable? Question #3 - Are the results of the oil sample report from Blackstone Labs consistent with an engine with approx 38,000 miles (see attached)? Question #4 - Any thing in the oil sample report that a knowledgeable Cat mechanic would be concerned about?