7,470 mi. on oil (90 days)...14,950mi. on filter (Honda) Sales car 60/40 hy/city...oil stays hot all day. Report/AVG. Aluminum 3/3 Chromium 1/1 Iron 8/8 Copper 1/3 Lead 0/1 Moly 435/86 Nickel 0/0 Manganese 0/2 Silver 0/0 Titanium 0/0 Potassium 2/1 Boron 17/65 Silicon 8/11 Sodium 92/11 Calcium 1597/2395 Magnesium 8/67 Phosphorus 730/724 Zinc 910/861 Barium 0/0 BlackStone comment: We think it highly unlikely your 45,000 miles Honda engine is leaking anti-freeze into the oil, but that is what the sodium and potassium in this sample suggest. Sodium can be an oil additive though we've not known Chevron to use at as such. Mobil and Castrol do. You engine is wearing perfectly so regardless of the source of the sodium, you can continue on operating the engine normally, but do be on the lookout for loss of coolant. No moisture present. The oil's viscosity was low. If you send in a sample of the Chevron oil we will analyze it for no charge. I paid for TBN but don't see it reported. called B/S. I'm looking to go 10k on oil and 20k on filter..thoughts welcomed!