An ecu dump is not really that informative. If someone downshifts too early it is going to show an over rev condition. That doesn't mean that the engine has actually been abused, they could have just missed a shift. What is even more important is the regular maintenance of the car.
The Toyota engine is quite durable. Like any engine it needs good maintenance (oil changes, filters, fresh spark plugs and proper coolant levels) to last a long time.
I had a Chevy pickup with a 454 cu. in. engine back in the 70's that I pulled a 32 foot 16,000 # 5th wheel with all over the country, including through the mountains, Death Valley and Montana snows. I got 95,000 miles of the engine before a rebuild. I did oil changes with filters every 2,500 miles, annually changed the transmission fluid and filter and changed the oil in the differential.
It's all about preventative maintenance!
