That'll keep fuel from collecting on the cylinder walls and keep the rings moving freely.It is driven hard, paddle shifting most of the time at 3500 -5000 rpm, 135 miles a day minimum 80% freeway at 70-90 mph
How did the intake valves look?I did break an exhaust valve at 150,000 miles due to a spark plug breaking and had to do a valve job, but on opening up the engine it looked "new".
That'll keep fuel from collecting on the cylinder walls and keep the rings moving freely.
I bet you didn't baby it during break-in.
Since about 1995. For every car, motorcycle, Ive owned in the last 25 years (7 new cars (1 Lincoln LS, 2 Fors SHO, 2 Infiniti, 1 MBZ, 3 Harleys, 1 Kawasaki quad, I do break in for 50-100 miles easy, then drive hard but vary speed for first 1000 miles.
Prior to that 1975 -2000 I broke in engines easier for the first 1000 miles. That was back when we had to do 3000 mile OCI, 15-20,000 Tune ups, and engines rarely lasted more than 75,000 - 100,000 miles other than the Hondas and Toyota
How did the intake valves look?
All valves including the broken #3 exhaust were clean, no signs of wear.
Had you done anything up to that point to clean them?
Every 30,000 or so CRC GDI Intake Cleaner
Re who has the original engine: there is a "silent majority" of trouble free owners we'll never hear from on the internet.
I agree, the forums and even what we see at the dealers are still about 10% or lees from my reading of failed engines. there are hundreds of thousands of Theta II world wide running in to the the 200,000-300,000 mile range.