8000 miles represents about 100 million cylinder firings. If you consume a quart or liter in this interval, the engine is consuming 10 nanoliters per firing (1/2500th of one drop). This is an incredible oil efficiency, it's hard to imagine improving upon it. This B6324 engine has near ideal dynamic balance, and this reduces wear and preserves tolerances. I've had 11 Volvos, and this engine, designed by the Swedes, built by Ford in Wales, is the best one yet. That said, the early T6 engines went out without oil pressure sensors, a serious lapse of design.