Been wondering how my engine is doing with 336,705 miles on the clock. Been chipped since 40k miles and do extended oil change intervals using Mobil1 5W-30. Have gone as long as 22k miles between oil changes, usually change between 15-17k miles. In the early days of the extended drains I had the oil tested and it was pretty well done at 22k miles. The additives were all used up. I am still on the stock turbo also.
#1 160 PSI
#2 160 PSI
#3 163 PSI
#3 165 PSI
Only major mechanical work was having the head rebuilt last year after a bolt failed on PD Performance Timing Belt Kit. We also used all the same lifters and the Camchain tensioner as well during the rebuild. I think the numbers are very good all things considered.