This run is 50% short trips and 10-15 minute warm up during winter months. Air filter was replaced with EAA at 26,220 miles. Oil filter is a EAO32. UOA was done by OAI. I use a 50/50 of FP Plus and Bio-Plus injector cleaner at every fill up. Miles on oil: 2380/1503 Time on oil: 1 year Oil: Amsoil Castrol/ASL 5W30/ASL 5W30 Make up oil: 16 oz. Miles on oil: 2380/1503/6256 Iron 18/9/33 Chromium 2/2/1 Lead 12/6/10 Copper 65/32/60 Tin 2/0/1 Aluminum 5/4/4 Nickel 0/0/1 Silver 0/0/0 Silicon 9/57/25 Boron 3/239/180 Sodium 70/27/6 Magnesium 14/19/0 Calcium 1946/3177/2893 Barium 0/0/0 Phosphorus 596/917/630 Zinc 596/957/746 Molybdenum 43/60/55 Titanium 0/0/0 Vanadium 0/0/0 Potassium 212/0/1 Fuel <1/<1/1.4% Visc100 9.88/9.72/9.8 Water 0/0/<1% Coolant Yes/No/No Nitr NA/5.0/16 Oxid NA/1.0/11 TBN 9.88/6.63/9.8 I am struggling to keep silicon down, I cleaned air filter at last OCI. I have flushed since coolant leak and found wire loom pinched in air box. I did nothing with air filter this OCI. High copper, iron a little high and fuel dilution of 1.4%, it's always something. Sometimes I wonder about not doing UOA's but the not knowing kills me. I am going to sample before winter and see what happens. Any comments or suggestions?