GT Pony
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Oil consumption is a strong function of engine RPM, and oil lost past the rings and also out through the PCV system. Truck engines, even when working hard, wont typically be at a real high RPM like someone driving a Mustang hard, so I'd expect less oil usage overall.Maybe it is because a truck engine works harder more often? If you are hauling heavy waits and towing, that will put more pressure than a car you WOT once in a while. Obviously if you track or drag your car often, it could put similar pressure on the engine. If this is true, they have most likely seen many more trucks with oil consumption issues than Mustangs coming in. If enough Mustangs have this issue I would hope they would announce a similar TSB for them.
Some engines use more oil under light loads at high RPM because the rings are low tension and will "flutter" which makes for less sealing effectiveness. Higher loads means higher cylinder pressure, and sometimes that actually helps rings seal a bit better. All of this of course is dependent on piston and ring design.
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