bumpity, results are in!
Comments: Most wear metals wore close to universal averages. ONly iron, which tracks with miles on oil was higher. The filter change @ 5K kept insolubles inline. The TBN was 2.4, so only a little additive was left, 1.0 is low. No fuel dillution was present do we don't know why the viscosity shifted to a 20W SAE range other than the added oil. WE did not find any water or anitfreeze in this sample. Silicon was good showing normal air filtration. We think 10K mile interval is all this turbo engine can handle in order to keep wear metals near averages.
Aluminum: 3
Chromium: 1
Iron: 15
Copper: 4
Lead: 7
Tin: 3
Molybdenum: 108
Nickel: 0
Manganese: 1
Silver: 0
Titanium: 0
Potassium: 1
Boron: 3
Silicon: 8
Sodium: 3
Calcium: 2249
Magnesium: 227
Phosphorus: 849
Zinc: 950
Barium: 0
Viscosity: 58.3
Flashpoint: 375
Fuel: <0.5
Antifreeze: 0
Water: 0
Insolubles: 0.5
TBN: 2.4
Now time for me to go over to Bobis theoilguy. I wonder what the TBN is on a VOA for RP?? And also this change in viscosity is the first time it's happened. . .make up oil was only .5 qts this time (other intervals it's been 2+ qts and this didn't happen).
Specs about car and engine:
10K on oil, filter changed at 5K
60K on engine
stage 4 wrx for 35K, stock prior to that