Symphony
Senior Member
If there are no leaks, no corrosion, the engines start right up from cold, smoke stops after warm up, you can hear the turbo spool up, boat runs at WOT without overheating, temperatures taken with laser on each engine match, engine room looks clean, invoices for work are there or a maintenance log - I'd say you have better than anything an engine survey could tell you. these engines are very reliable and forgiving.