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Cooler flow is a controlled and calculated bleed to the system. The new Fords I work on have a thermostat in the cooler line system that only allows flow when the oil is up to temp. This makes my flush machine not work properly because the thermostat stops the flow. So it is back to drain and refill on the new stuff.
Use whatever lines you feel good about.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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