This is the first sampling for my 2010 Subaru Forester with the N/A 2.5L engine. The oil was 5w-30 Kendall Synthetic blend GT1 (probably SN but was changed by a local shop), subaru blue oil filter, and Fram air filter. Miles on the oil was 6100 miles and 49911 miles on the Forester total. The Forester is driven by my wife and sees trips daily of 25 miles always getting up to temperature, no short trips. Driving is pretty easy but is 50/50 city/interstate with some rush hour traffic here is Portland, OR. The Forester has been a great SUV. Not a single issue yet in 50k miles. This UOA was just to do a check up on the oil/engine and make sure I didn't have any leaks, coolant, or other issues. Oil was changed. M1 5w-30 SN went in with Fram Ultra oil filter. No make up oil was added. The UOA looks good to me. TBN is a little low (2.0 is low by ALS lab method) but not used up and other contaminants look fine. Only thing that caught my eye was some viscostity loss (according to Kendall spec sheet virgin viscosity @ 100C is 11.0). I will be running the OCI with the M1 out to 10k which is ~1year and resample.
This is ALS labs in Portland, OR. These are the NAPA UOA kits. You don't get as much info as other labs but the analysis is really cheap. The Forester is still under warrarnty until 60k miles so I try to go by the book which is max 7500 mile OCI.
DATE SAMPLED 20-Dec-13 Miles on OCI 6100 Miles on unit 49911 Make up oil: none Metals (ppm) Iron (Fe) 4 Chromium (Cr) <1 Lead (Pb) <1 Copper (Cu) 7 Tin (Sn) <1 Aluminium (Al) 3 Nickel (Ni) <1 Silver (Ag) <1 Titanium (Ti) 87 Vanadium (V) <1 Contaminants (ppm) Silicon (Si) 8 Sodium (Na) <1 Potassium (K) <5 Water (%) <0.05 Coolant No Additives (ppm) Magnesium (Mg) 14 Calcium (Ca) 2330 Barium (Ba) <1 Phosphorus (P) 702 Zinc (Zn) 799 Molybdenum (Mo) 35 Boron (B) 54 Physical Tests Viscosity (cSt 100C) 9.4 Physical / Chemical Base Number (mgKOH/g) 2.2 (Caution) Here is what the lab said: All wear levels appear within acceptable limits for first sample. Silicon level (dirt/sealant material) satisfactory. Water content acceptable. TBN below recommended limit. Viscosity within specified operating range. Action: Change oil and filter(s) if not already done. Resample at next recommended interval to monitor and establish wear trend.