I hope some of the experts on the forum can enlighten me as to how the oil flows through the cooler on the 2600. When the thermostat is closed, is ALL the oil stopped from flowing through the cooler? When the thermostat opens, does ALL the oil then flow through the cooler, or only some of the oil? When a fresh engine is installed in the car, it would seem no oil will flow to the cooler until the thermostat opens and then the cooler would fill, thus lowering the oil level in the sump until more oil is added to bring the level up to the "full" mark again. Does the cooler receive oil before or after the filter? I appreciate the help in understanding the oil flows through the 2600 motor.