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7488 miles on this oil change interval, 46000 miles total. Oil used Mobil 1 Formula M 5W-40, oil filter MB fleece filter. Lab: Blackstone Aluminum 2 Chromium 0 Iron 11 Copper 9 Lead 1 Tin 2 Moly 77 Nickel 1 Manganese 0 Silver 0 Titanium 0 Potassium 1 Boron 107 Silicon 6 Sodium...

Background: This is a Volvo XC90 T6, it started to use one quart of coolant every week. The Volvo coolant says Phosphate free contains ethylene glycol. Oil used: Castrol GTX 10W/30 Miles on oil: 511 Miles on unit: 51260 Blackstone comments: " It's hard to get good data with less than 1000...