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I have 90,000 and the piston tops are so clean you can read the numbers off the top. I also have kept mobil 1 since new in 1992 and ran 93 octane and BG 44K a few times. The compression is still in factory specs. They will last before the chassis will that is for sure. My uncle has pulled motors that had 300,000 VG30DE from maximas and are very clean with no virtual wear on the cylinders. This is because the motors have very tight tolerances and Nissan is very true with honing process.
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