Let me start by saying that I'm on a work computer which limits what and how I post here. Hence, the formatting which may not conform to BITOG standards. My first post here at BITOG in about 8 years. I appreciate any feedback you folks can give me on this first sample of my new-to-me Lexus with 122,000kms (80k miles or so). Prior to my QS oil change, this car was serviced at Lexus with Toyota 5W20 oil since delivery by the previous owner. I put 6000 miles on this oil. What concerns me is the Sodium number. There is no obvious signs of internal coolant issue on the car (sludge, smoke etc). There IS a significant coolant leak at the water pump which I'm repairing later this week. Also, I did add 3 qts of top-up oil during the 6k miles. Keep in mind that this vehicle has a 9.1 qt sump.
We're not seeing any mechanical factors for the oil loss here, but remember: make-up oil can dilute the oil and that might be hiding a mechanical problem if one exists. Assuming that's not the case though (because metals do look good). Sodium was a bit elevated and it a marker for coolant, but it's probably just residual additive from a previous oil. No fuel or moisture was found. We're not entirely sure where the oil's going. Any smoke from the exhaust or spots on the ground? Unit/Location Avg Universal Averages ALUMINUM 3 3 CHROMIUM 0 0 IRON 9 7 COPPER 1 2 LEAD 0 0 TIN 0 0 MOLYBDENUM 159 115 NICKEL 0 0 MANGANESE 0 1 SILVER 0 0 TITANIUM 4 1 POTASSIUM 6 2 BORON 18 25 SILICON 7 14 SODIUM 85 54 CALCIUM 2171 2124 MAGNESIUM 9 161 PHOSPHORUS 7 679 ZINC 38 809 BARIUM 0 0 Values Should Be* SUS Viscosity @ 210°F 51.6 46-57 cSt Viscosity @ 100°C 7.7 6.0-9.7 Flashpoint in °F 430 >355 Fuel % <.5 <2.0 Antifreeze % 0 0 Water % 0 <0.1 Insolubles % .2 <.6