Here's another report for my 2002 WS6 TransAm. I don't drive the car much at all and there's not many miles on this sample but thought I would post it anyway. I'm thinking about changing to PP but I'll post up info and questions on that up in gas engine area. Seems Amsoil is probably over kill for my application. Blackstone Report: Leaving the oil in place for 13 months wasn't a problem. As long as an oil doesn't become contaminated (with excess wear metals, fuel, coolant, etc.) it can be left in place. This oil wasn't run very long and you can see that wear was quite low. Try going 1,000 miles on the next oil. The TBN was still strong at 6.7 so this oil had lots of active additive remaining. 1.0 is too low. Universal averages for the GM 5.7L are based on an oil run of ~3,500 miles. At 27,344 miles we have no problems to report. Looks like a nicely wearing engine.
2002 Pontiac Firbird TransAm OIL Amsoil Euro 5w40 Filer: K&N MILES IN USE 544 MILES 27,344 SAMPLE TAKEN 4/5/08 ALUMINUM 1 CHROMIUM 0 IRON 6 COPPER 12 LEAD 3 TIN 0 MOLYBDENUM 5 NICKEL 1 MANGANESE 0 SILVER 0 TITANIUM 0 POTASSIUM 1 BORON 59 SILICON 8 SODIUM 4 CALCIUM 2054 MAGNESIUM 82 PHOSPHORUS 779 ZINC 983 BARIUM 0 INSOLUBLES 0.2 WATER 0 Fuel <0.5 FLASHPOINT ºF 390 SUS VIS 210ºF 68.3 cSt @ 212ºF 12.49