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Some interesting parallels with my post and lead levels in my Nissan here: http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1832402#Post1832402

Cleaning the distributor drive at this point (~10K miles) is too little too late. If this is the culprit, most likely damage to the bearings is already done. I asked the technician to please carefully clean the distributor drive gear for this very reason. I don't know for a fact if it was...

The supercharger was not replaced, but was inspected by me and the technician and found to be in good order. The M-62 blower has coated rotors (teflon coating?)which can flake off and cause problems. My rotors and bearings in the supercharger showed no signs of problems. The only possible...

Unlikely fuel with lead is the culprit since I always fill up at the same station and keep every receipt with mileage noted. I should also note that this vehicle is used only in warm weather, mostly in the summer and never when the temp is below freezing. Going to 5w30 for sure.

This is the third UOA and as you can see the lead numbers have been steadily increasing. My concern is that time is running out on my warranty. As this vehicle is not my daily driver, by the time I have enough miles to determine a trend, I may well be out of warranty with a bad rod bearing. I...

One possible explanation is that the replacement engine was contaminated with bearing material from the original engine. Bearing metal was all through the original engine and the distributor drive gear is the only part that was reused on the replacement engine. If the distributor drive gear was...

Nissan put up quite a fight the first time but I did finally prevail. I can only imagine what they will say when I contact them again.

This is a factory replacement engine VG33ER (supercharged)that has been carefully broken in with short OCI. The most recent oil analysis showed a mysterious spike in lead. I have used no additives and only premium fuel as this supercharged engine calls for. This engine is a warranty replacement...