Here's my latest UOA on my Audi. I'm pleased with the report particularly with the fuel dilution, viscosity, and flash point. I think the over all wear numbers look good and the only elevated numbers Iron and Silicon are probably ok in that the voa numbers for those for that batch of GC are 4 and 7 respectively. Also the Air filter was on its last OCI life so that could have contributed to the elevated Silicon.
As for the lower fuel dilution between this UOA and the previous it appears that having the PCV systems serviced and all defective tubes and valves replaced and replacing the coil packs corrected that issue.
Also I ran a double Auto-RX treatment between both OCI's and replaced the valve cover gasket and there is no sludge on the top end. Some varnish that the Auto-RX treatment didn't remove but no sludge. The leaking valve cover gasket is where my 1 qt of oil usage went as now after the gasket change and up till it started leaking I never regardless of oil used saw any discernible oil usage.
Blackstone pointed out that the viscosity was a little high for a 0w30 but still within the SAE 30W grade range. Just what I wanted, Good ole GC anti shear properties as the VOA viscosity for that batch of GC was 66.2 SUS @ 210 F.
There was 4 oz of LC20 added at the beginning of the OCI and maybe 1 ounce more later in the OCI. I was out of LC20 and procrastinated on ordering more so I didn't follow the LC recommended 1 oz per 1000 miles on this OCI.
Looking forward to everyones comments.
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Date 9/3/2008 8/19/06 11/05/05 Lab Blackstone Blackstone Blackstone ***Vehicle ID*** Make Audi Audi Audi Univ Avg Model A4 A4 A4 NR Year 2000 2000 2000 NR Engine 1.8t L4 1.8t L4 1.8t L4 NR Miles on Vehicle 126174 100649 90800 NR ***Oil Identification*** Oil Brand Castrol GC Castrol GC Mobil NR Oil Series M030426B M033246B M1 NR Oil SAE J300 0W30 0W30 0W40 NR API SX SL SL SM NR Miles on Oil 5600 5200 4800 NR Months In Service 6 5 5 NR Makeup Oil 1 0 0 ***Elements*** Antimony Sb NR NR NR NR Cadmium Cd NR NR NR NR Vanadium V NR NR NR NR Aluminum Al 2 2 2 4 Chromium Cr 0 0 0 1 Iron Fe 9 5 15 16 Copper Cu 4 5 2 6 Lead Pb 3 3 1 2 Tin Sn 0 0 2 1 Molybdenum Mo 3 3 65 47 Nickel 0 0 0 1 Manganese Mn 1 1 0 1 Silver Ag 0 0 0 0 Titanium Ti 0 0 0 0 Potassium K 1 2 0 1 Boron B 1 1 91 52 Silicon Si 14 10 5 9 Sodium Na 2 0 5 7 Calcium Ca 2802 2834 2334 2184 Magnesium Mg 134 111 12 245 Phosporus P 753 714 713 751 Zinc Zn 906 822 802 897 Barium Ba 0 0 0 0 ***Viscosity*** cST @ 100 C 11.99 NR NR NR SUS @ 210 F 66.4 64.7 64.7 ***Misc*** Flashpoint (F) 370 355 365 NR Fuel % <0.5 1.5 0.5 NR Antifreeze % 0 0 0 NR Water % 0 0 0 NR Insolubles % 0.4 0.3 0.3 NR Sulfur NR NR NR NR Oxidation NR NR NR NR Nitration NR NR NR NR TBN 1.7 2.3 3.0 Ferrous Debris NR NR NR NR Fuel Soot % NR NR NR NR Glycol NR NR NR NR ISO Code NR NR NR NR Additives NR NR NR NR URL NR NR NR NR Notes NR NR NR NA Location Georgia Georgia Georgia NR ***Filters used*** Air Filter Mann Mann Mann Oil Filter Mann Mann Audi OEM ***Particle Count*** >2 micron NR NR NR NR >5 micron NR NR NR NR >10 micron NR NR NR NR >15 micron NR NR NR NR >25 micron NR NR NR NR >50 micron NR NR NR NR >100 micron NR NR NR NR
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Real pain.. you got it.
