1994 Pontiac Grand Am 3.1L V6 automatic GM 5W30 API SL 1 bottle of AutoRx added at beginning of OCI 3/4 Highway driving AC Delco oil filter Sample taken Jan-15-2005 1,765 miles on oil - 1 month 146,963 miles on car Blackstone did the current UOA. OAI did the other UOAs. I'm going to start using Blackstone I believe. 1st #: Current 2nd #: 12,504 milles S2K 0W30 3rd #: 18,331 miles S2K 0W30 Iron - 5/37/44 Chromium - 0/2/3 Lead - 1/21/23 Copper - 1/20/17 Tin - 0/0/0/0 Aluminum - 1/12/12 Nickel - 0/0/0 Silver - 0/0/0 Silicon - 8/76/144 abnormal Boron - 3/31/25 Sodium - 15/245 abnormal/74 abnormal/ Manganese - 0/NA/NA Magnesium - 47/874/457 Calcium - 908/2804/1796 Barium - 0/0/0 Phosphorus - 392/1071/882 Zinc - 423/1224/1268 Molybdenum - 0/14/13 Titanium - 0/0/0 Vanadium - NA/0/0 Potassium - 0/35 abnormal/55 abnormal Fuel <0.5/<1/<1 Viscosity: 9.49 cst/17.87 cst abnormal /16.80 cSt - abnormal Water - 0.0/0/0% Glycol - 0.0/NEG/NEG TBN - 3.3/3.38/3.0 Oxidation - NA/13.0/14.0 Nitration - NA/10.0/12.0 Insolubles - 0.4/NA/NA Flashpoint - 400°F/NA/NA Blackstone's comments: Wear was very low in this sample from your Grand Am, which makes since considering you only ran this oil 1765 miles. The universal averages shows typical wear from this type of engine after 3800 miles on the oil. The TBN read 3.3, so the oil still contains some active additive. We consider anything from 1.0 and lower to be too low. Note the additives in your sample. They appear to be low, though we didn't find any cause for it in your oil like moisture, fuel, or coolant. Maybe they have been diluted by the AutoRx. Use 1750 miles again and check back. UOA history: newest to oldest with Castrol GTX http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=3;t=001379 http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic&f=3&t=001378#000002 http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic&f=3&t=001377#000000 Added 5 pack of GM cooling tabs 1,152 miles into OCI at 146,350 miles. At least the sodium & potassium have went away. Yeah! Oil was changed at sampling with GM 5W30 SL and a new AC Delco oil filter. Comments, fire away!