Lack of oil is not good for an engine I hasten to add it was serviced regularly and no expense was spared as one of the perks of being in the trade and having my own bike business at the time was I had full time staff to maintain it and everything was cost price but went through the business. It was on 140,000 miles and as you know it has a sight glass for checking the engine oil level rather than a dip stick. It looked fine, but it transpired that the sight glass had become stained and looked like it had the right oil quantity. No engine oil + a high speed run + a dodgy sight glass = blown engine. Replacement engine went in and was good for another 25,000 miles before it got sold for the first Blackbird in 96. Wow , that's cheered me up,140,000 miles means mines' barely run in by comparison . How on earth did you find the time to clock 165,000 miles in only 3 years?